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1.
BMC Gastroenterol ; 19(1): 187, 2019 Nov 14.
Article in English | MEDLINE | ID: mdl-31727083

ABSTRACT

BACKGROUND: Hepatic epithelioid hemangioendothelioma (HEH) is rare; it is reported in < 1 person in 1,000,000 individuals. For accurate diagnosis, information regarding multiple graphic modalities in HEH is required. However, there is very little information concerning Sonazoid® contrast enhanced ultrasonography (CEUS) in HEH. CASE PRESENTATION: The present report describes the histologically proven three HEH cases evaluated using Sonazoid® CEUS. Case 1 was a 33-year-old female patient with no relevant past medical history, who experienced right upper quadrant pain. Conventional abdominal US revealed multiple low echoic liver nodules with vague borderlines. In CEUS, the vascularity of the nodules was similar to that seen in the neighboring normal liver. Later in the portal venous and late phases (PVLP) and post vascular phase, washout of Sonazoid® was detected in the nodules. Case 2 was a 93-year-old female patient with a previous medical history including operations for breast cancer and ovary cancer in her 50's. Conventional abdominal US revealed multiple low echoic nodules, some of which contained cystic lesions. In the early vascular phase of CEUS, nodules excluding the central anechoic regions were enhanced from peripheral sites. Although the enhancement inside the nodules persisted in both the PVLP and post vascular phase, anechoic areas in the center of some nodules were not enhanced at all. Case 3 was a 39-year-old male patient presented with right upper-quadrant pain, without any relevant past medical history. Conventional abdominal US revealed multiple low echoic liver nodules. In the early vascular phase of CEUS, nodules were gradually enhanced from the peripheral sites as ringed enhancement. Sonazoid®was washed out from the nodules in the PVLP and post vascular phase. CONCLUSIONS: The most important feature was peripheral enhancement in the early vascular phase. In case 2, the enhancement of the parenchyma of liver nodules persisted even in the PVLP; indicating the lower degree of malignant potential than others. Actually, the tumors did not extend without any treatment in case 2. Since case 2 is the first case report of HEH with cystic lesions, in patients with liver nodules including cystic lesions, HEH is a potential diagnosis.


Subject(s)
Ferric Compounds/pharmacology , Hemangioendothelioma, Epithelioid , Iron/pharmacology , Liver Neoplasms , Oxides/pharmacology , Ultrasonography/methods , Adult , Aged, 80 and over , Contrast Media/pharmacology , Diagnosis, Differential , Female , Hemangioendothelioma, Epithelioid/diagnosis , Hemangioendothelioma, Epithelioid/pathology , Humans , Image Enhancement/methods , Liver Neoplasms/diagnosis , Liver Neoplasms/pathology , Male , Perfusion Imaging
2.
Am J Case Rep ; 20: 933-936, 2019 Jun 30.
Article in English | MEDLINE | ID: mdl-31256189

ABSTRACT

BACKGROUND Intracardiac thrombosis has been known to be associated with not only hepatocellular carcinoma but also with amyloidosis and use of a cardiac implantable electronic device. We report a case of a continuous tumor thrombus with hepatocellular carcinoma from the portal vein and hepatic vein to the right atrium via the inferior vena cava in a patient with a cardiac amyloidosis and an implanted cardiac resynchronization therapy (CRT) device. CASE REPORT A 68-year-old female first admitted to our hospital because of heart failure with an AL type primary cardiac amyloidosis. After 3 years, she underwent an implantation of a CRT device for biventricular pacing following repeated episodes of heart failure and low left ventricular ejection fraction of 34% with NYHA class III. Again, she presented with symptoms of heart failure and cardiomegaly on chest x-ray at 7 years after the CRT device implantation. The echocardiography showed a huge echogenic mass occupying the right atrium, and 64 multi-detector computed tomography showed a lobulated heterogeneously enhancing mass of hepatocellular carcinoma in the right upper lobe of her liver and a continuous tumor thrombus from the portal vein and hepatic vein to the right atrium via the inferior vena cava. CONCLUSIONS Intracardiac thrombosis and heart failure occurred in a patient with hepatocellular carcinoma and cardiac amyloidosis, who had an implanted CRT device, which resulted not only in hypercoagulability by the hepatocellular carcinoma itself and the accumulation of various risk factors, but also the progression of myocardial damage with the development of amyloidosis.


Subject(s)
Amyloidosis/complications , Carcinoma, Hepatocellular/complications , Heart Diseases/complications , Heart Failure/complications , Liver Neoplasms/complications , Thrombosis/complications , Aged , Amyloidosis/surgery , Cardiac Resynchronization Therapy Devices , Echocardiography , Female , Heart Diseases/surgery , Heart Failure/surgery , Humans , Risk Factors , Thrombophilia , Thrombosis/surgery , Tomography, X-Ray Computed
3.
Breast Cancer ; 26(5): 552-561, 2019 Sep.
Article in English | MEDLINE | ID: mdl-30820924

ABSTRACT

BACKGROUND: There is no consensus on the appropriate surveillance for high-risk women with breast cancer in Japan. We investigated their imaging features and pathological characteristics to build a proper surveillance system for asymptomatic high-risk individuals in the future. METHODS: We retrospectively reviewed 93 female (median age 43 years) BRCA1 and BRCA2 mutation carriers from our institutional clinical database from 2011 to 2017. The study population was composed of 112 breast cancers. Mammography and MRI were reviewed by examiners blinded to patients' clinical history. Final surgical or biopsy histopathology served as the reference standard in all the patients. RESULTS: Fifty-nine breast cancers met selection criteria; of these, 30 were BRCA1-associated tumors, and 29 were BRCA2-associated tumors. Invasive ductal carcinoma was the most prevalent type in both BRCA1 and BRCA2. There were statistically significant differences in phenotype, nuclear grade, and Ki-67 labeling index between BRCA1 and BRCA2 mutation carriers. Additionally, imaging findings on mammography and MRI were statistically different. Tumors in BRCA2 carriers demonstrated mammographic calcifications more frequently, while those in BRCA1 carriers demonstrated a mass or architectural distortion (P < 0.001). Enhancement pattern on MRI also significantly differed between the two subgroups (P = 0.006). The size of MRI-detected lesions was statistically smaller than the size of those detected by other modalities (P = 0.004). CONCLUSIONS: The imaging and histological characteristics of BRCA1/2 mutation carriers were consistent with other countries' studies. MRI-detected lesions were significantly smaller than lesions detected by non-MRI modality. All lesions in BRCA1 mutation carriers could be detected by MRI.


Subject(s)
Breast Neoplasms/diagnostic imaging , Breast Neoplasms/genetics , Carcinoma, Ductal, Breast/diagnostic imaging , Carcinoma, Ductal, Breast/genetics , Genes, BRCA1 , Genes, BRCA2 , Magnetic Resonance Imaging , Mutation , Adult , Aged , Biopsy , Breast Neoplasms/pathology , Carcinoma, Ductal, Breast/pathology , Female , Follow-Up Studies , Humans , Japan , Mammography , Mass Screening/methods , Middle Aged , Public Health Surveillance/methods , Retrospective Studies , Young Adult
4.
Abdom Radiol (NY) ; 44(3): 923-935, 2019 03.
Article in English | MEDLINE | ID: mdl-30327828

ABSTRACT

PURPOSE: To retrospectively evaluate the utility of fusion images of pre- and post-ablation hepatobiliary phase (HBP) series to assess the ablation margins after radiofrequency ablation (RFA) of hepatocellular carcinomas (HCCs). Additionally, to identify factors indicative of an adequate ablation margin and predictors of local tumor progression (LTP). METHODS: Fifty-nine HCCs in 29 patients were treated by RFA and followed-up for > 1 year (mean 37.9 months). Fusion images of pre- and post-ablation HBP series were created using a non-rigid registration and manual correlation. The ablation margin appearance was classified as ablation margin + (ablation margin completely surrounding the tumor), ablation margin-zero (a partially discontinuous ablation margin without protrusion of HCC), ablation margin-(a partially discontinuous ablation margin with protrusion of HCC), and indeterminate (index tumor was not visible). The minimal ablation margin was measured, and clinical factors were examined to identify other risk factors for LTP. RESULTS: LTP was observed at follow-up in 12 tumors. The mean minimal ablation margin was 3.6 mm. Multivariate analysis revealed that the ablation margin status was the only significant factor (p = 0.028). The cumulative LTP rates (3.3%, 3.3%, and 3.3% at 1, 2, and 3 years, respectively) in 30 ablation margin + nodules were significantly lower (p = 0.006) than those (20.0%, 28.0%, and 32.2% at 1, 2, and 3 years, respectively) in 25 ablation margin-zero nodules. CONCLUSIONS: Fusion images enable an early assessment of the ablation efficacy in the majority of HCCs. The ablation margin status is a significant factor for LTP.


Subject(s)
Carcinoma, Hepatocellular/diagnostic imaging , Carcinoma, Hepatocellular/surgery , Catheter Ablation/methods , Image Interpretation, Computer-Assisted/methods , Liver Neoplasms/diagnostic imaging , Liver Neoplasms/surgery , Margins of Excision , Adult , Aged , Aged, 80 and over , Female , Follow-Up Studies , Humans , Liver/diagnostic imaging , Liver/surgery , Magnetic Resonance Imaging/methods , Male , Middle Aged , Retrospective Studies , Treatment Outcome
5.
Abdom Radiol (NY) ; 43(7): 1535-1539, 2018 07.
Article in English | MEDLINE | ID: mdl-29623349

ABSTRACT

Intracystic papillary neoplasm (ICPN) of gallbladder is a comparatively new concept and is described as pre-malignant lesions in Nakanuma et al. (In: Bosman et al. (eds) WHO Classification of Tumours of the Digestive System, World Health Organization of Tumours, IARC, Lyon, 2010). ICPN with high-grade intraepithelial neoplasia is understood to include intraepithelial carcinoma or noninvasive carcinoma. And lesions with invasive cancer components are classified as ICPN with an associated invasive carcinoma [1]. According to Adsay et al., more than half of patients diagnosed with ICPN have invasive cancer components (Adsay et al., Am J Surg Pathol 36:1279-1301, 2012).Polypoid masses in the gallbladder including benign, malignant, and non-neoplastic lesions have been called gallbladder polyps, and ICPN is also a polypoid lesion in the gallbladder. However, it is difficult to differentiate between them. In the literature, it is said that the possibility of malignancy is high in lesions exceeding 1 cm (Terzi et al., Surgery 127:622-627, 2000). And there are few reports on characteristic imaging findings of ICPN.We have experienced three cases (two females and one male) of ICPN and report our imaging findings. Contrast-enhanced computed tomography revealed large papillary polypoid lesions approximately 2-4 cm in size in the gallbladder. Findings suggestive of deformation of the gallbladder wall and extrinsic progression were absent in all cases. T2-weighted magnetic resonance imaging revealed intense signals and diffusion-weighted imaging showed high intensity. Expanding of the gallbladder was seen in case 1, and a tumor stalk-like appearance was seen in the papillary mass in cases 2 and 3. Surgery was performed in all three cases and ICPN was diagnosed pathologically. The cancer was localized to the mucosa, with no infiltration of surrounding tissue in all three cases.


Subject(s)
Carcinoma, Papillary/diagnostic imaging , Gallbladder Neoplasms/diagnostic imaging , Magnetic Resonance Imaging/methods , Tomography, X-Ray Computed/methods , Aged , Aged, 80 and over , Carcinoma, Papillary/surgery , Contrast Media , Female , Gallbladder/diagnostic imaging , Gallbladder/surgery , Gallbladder Neoplasms/surgery , Humans , Male , Middle Aged , Radiographic Image Enhancement
6.
Jpn J Radiol ; 36(3): 209-214, 2018 Mar.
Article in English | MEDLINE | ID: mdl-29224115

ABSTRACT

PURPOSE: To evaluate the usefulness of computed tomographic (CT) features for identifying acute torsion of uterine subserosal leiomyoma (USL). SUBJECTS AND METHODS: We analyzed contrast-enhanced CT examinations of 7 USLs with torsion and 44 USLs without torsion. Two radiologists evaluated the CT features, which consisted of poor contrast enhancement inside the USL, thin rim enhancement around the USL, calcification within the USL, a beak sign between the uterus and USL, fan-shaped poor contrast enhancement in the uterus area adjacent to the USL (dark fan sign), and ascites. We analyzed the frequencies of these CT features in the USLs with versus without torsion using Fisher's exact test. RESULTS: The respective frequencies of CT features in USLs with and without torsion were as follows: poor contrast enhancement, 86 and 5% (P = 0.001); thin rim enhancement, 71 and 9% (P = 0.001); calcification, 29 and 18% (P = 0.61); beak sign, 57 and 86% (P = 0.10); dark fan sign, 57 and 0% (P = 0.001); and ascites, 100 and 20% (P = 0.01). CONCLUSIONS: The CT features of poor contrast enhancement, thin rim enhancement, and dark fan sign are valuable for identifying acute torsion of USL.


Subject(s)
Leiomyoma/diagnostic imaging , Tomography, X-Ray Computed/methods , Uterine Neoplasms/diagnostic imaging , Adult , Aged , Aged, 80 and over , Contrast Media , Female , Humans , Middle Aged , Radiographic Image Enhancement/methods
7.
Front Aging Neurosci ; 9: 321, 2017.
Article in English | MEDLINE | ID: mdl-29033831

ABSTRACT

Background: Selegiline enhances the patient's endogenous dopamine by inhibiting dopamine metabolism. The efficacy of selegiline monotherapy for drug-naïve Parkinson's disease (PD) patients may depend on the degree of dopaminergic neuronal degeneration. 123I-Ioflupane single photon emission computed tomography (SPECT) and 123I-meta-iodobenzylguanidine (MIBG) myocardial scintigraphy are diagnostic methods to assess the pharmacological and pathological changes in PD. Objective: We examined the utility of these imaging methods to predict the efficacy of selegiline monotherapy for motor symptoms in drug-naïve PD patients. Methods: We observed the efficacy of selegiline monotherapy in 28 drug-naïve PD patients and compared the improvement in motor function and the imaging findings. These patients received selegiline monotherapy, and the amount was increased to the optimal dose in clinical practice. Motor function was assessed using the Unified Parkinson's Rating Scale (UPDRS) at baseline and at the stable dose. Imaging was performed before treatment, and the striatal Specific Binding Ratio (SBR) of the 123I-Ioflupane SPECT and the Heart-to-Mediastinum (H/M) ratio of the 123I-MIBG myocardial scintigraphy were calculated. Both ratios were compared with improvements in scores for motor assessment using Pearson's correlation coefficient. Results: The mean UPDRS part III score significantly improved with at least 5.0 mg/day of selegiline. Further dose escalation did not improve the mean motor score. The percent improvement in the motor score from baseline showed a significant negative correlation with the SBR of average of the right and left striatum, but not with the H/M ratio. Multiple regression analysis using patient's background factors showed that percent improvement in the UPDRS part III score directly correlate with the SBR (p = 0.04), but not with the age (p = 0.72), disease duration (p = 0.31), baseline UPDRS part III (p = 0.77) and the drug dose (p = 0.26). Conclusion: PD patients with a lower accumulation of 123I-Ioflupane in the striatum can have greater improvement with selegiline monotherapy.

8.
Ann Vasc Dis ; 10(4): 351-358, 2017 Dec 25.
Article in English | MEDLINE | ID: mdl-29515695

ABSTRACT

Objectives: Aneurysm shrinkage after EVAR is the strong factor of favorable outcomes after endovascular abdominal aortic aneurysm repair (EVAR), and type II endoleaks is the risk factor of no aneurysm shrinkage or aneurysm enlargement in the long term. In this study, we evaluate the aortic side branches relate to early postoperative type II endoleak, and performed coil embolization for those vessels for prevention of type II endoleak. Methods: Patency and diameter of aortic side branches including inferior mesenteric artery (IMA) and lumbar artery (LA) were evaluated in 56 consecutive patients with abdominal aortic aneurysm who were scheduled for EVAR. Coil embolization with Interlock was performed in 24 patients during EVAR for all patent IMA and LA with maximal diameter more than 2.0 mm. Computed tomography was performed one week after EVAR for evaluation of endoleak. Results: In patients with IMA more than 2.5 mm in diameter, the frequency of type II endoleak was approximately 90% regardless of the number of patent LA. In case with patent IMA less than 2.5 mm or with 2 or more patent LA larger than 2.0 mm, the frequency of type II endoleak was 46 to 67%. Coil embolization for IMA was successfully performed in 15/16 patients (94%). Coil embolization of LA was performed for patent LA larger than 2.0 mm and 29 out of 45 LA (64%) were successfully occluded. There was no perioperative complication associated with coil embolization. The frequency of type II endoleak was significantly lower in patients with coil embolization than those without coil embolization (4.2% vs 58.9%, p<0.0001). Conclusion: Patent IMA and LA in diameter larger than 2.0 mm were associated with type II endoleak one week after EVAR, and coil embolization with Interlock during EVAR is safe and effective procedure to prevent type II endoleak. (This is a translation of Jpn J Vasc Surg 2016; 25: 321-328.).

9.
Data Brief ; 7: 376-80, 2016 Jun.
Article in English | MEDLINE | ID: mdl-26977441

ABSTRACT

Our data shows the regional coronary artery calcium scores (lesion CAC) on multidetector computed tomography (MDCT) and the cross-section imaging on MDCT angiography (CTA) in the target lesion of the patients with stable angina pectoris who were scheduled for percutaneous coronary intervention (PCI). CAC and CTA data were measured using a 128-slice scanner (Somatom Definition AS+; Siemens Medical Solutions, Forchheim, Germany) before PCI. CAC was measured in a non-contrast-enhanced scan and was quantified using the Calcium Score module of SYNAPSE VINCENT software (Fujifilm Co. Tokyo, Japan) and expressed in Agatston units. CTA were then continued with a contrast-enhanced ECG gating to measure the severity of the calcified plaque condition. We present that both CAC and CTA data are used as a benchmark to consider the addition of rotational atherectomy during PCI to severely calcified plaque lesions.

10.
J Cardiovasc Comput Tomogr ; 10(3): 221-8, 2016.
Article in English | MEDLINE | ID: mdl-26811266

ABSTRACT

BACKGROUND: Rotational atherectomy (rotablation) has been proposed as a potentially superior strategy for percutaneous coronary intervention (PCI) in complex and severely calcified lesions. OBJECTIVES: We hypothesized that a per-lesion coronary artery calcium score determined by multidetector computed tomography (MDCT) would be useful for predicting the requriement for rotablation during PCI. METHODS: MDCT was performed in patients with stable angina pectoris who were scheduled for first PCI. In 116 consecutive subjects (168 target lesions) with successful PCI, MDCT and quantitative coronary angiography (QCA) data were retrospectively evaluated regarding their ability to predict rotablation. RESULTS: PCI without rotablation was performed in 105 patients (154 lesions), and rotablation was added in 11 patients (14 lesions). Patients with rotablation had significantly higher SYNTAX scores (p = 0.007) and total calcium scores (p < 0.001) than those without rotablation. Per-lesion, a lesion length ≥20 mm and diameter stenosis ≥74% on QCA as well as a per-lesion calcium score ≥453 and calcification arc ≥270 in MDCT predicted rotablation. After adjustment for potential confounding variables, a high per-lesion calcium score was an independent predictor of rotablation (odds ratio 31.3, 95% confidence interval 2.8-345, p = 0.005, sensitivity 93% and specificity 88%). CONCLUSION: The extent of target lesion calcification in MDCT, a simple marker of calcified plaque, is useful for predicting the need for rotablation during PCI.


Subject(s)
Angina, Stable/diagnostic imaging , Angina, Stable/therapy , Atherectomy, Coronary , Computed Tomography Angiography/methods , Coronary Angiography/methods , Coronary Artery Disease/diagnostic imaging , Coronary Artery Disease/therapy , Coronary Vessels/diagnostic imaging , Multidetector Computed Tomography/methods , Percutaneous Coronary Intervention , Vascular Calcification/diagnostic imaging , Vascular Calcification/therapy , Aged , Aged, 80 and over , Area Under Curve , Chi-Square Distribution , Female , Humans , Male , Middle Aged , Odds Ratio , Patient Selection , Predictive Value of Tests , ROC Curve , Retrospective Studies , Risk Factors , Severity of Illness Index , Treatment Outcome
11.
Magn Reson Med Sci ; 15(2): 212-9, 2016.
Article in English | MEDLINE | ID: mdl-26607809

ABSTRACT

PURPOSE: To evaluate morphological and signal intensity (SI) changes of placental insufficiency on magnetic resonance imaging (MRI) and to assess morphological changes and decreased flow voids (FVs) on T2-weighted rapid acquisition with relaxation enhancement (RARE) images for diagnosing placental insufficiency. METHODS: Fifty singleton fetuses underwent MRI using a 1.5-T MR scanner. Placental thickness, area, volume, SI, amniotic fluid SI, and size of FVs between the uterus and the placenta were measured on MR images. Two radiologists reviewed T2-weighted RARE images for globular appearance of the placenta and FVs between the uterus and the placenta. Data were analyzed using t-tests, McNemar's tests, and areas under the receiver operating characteristic curve (AUCs) at 5% level of significance. RESULTS: Twenty-five of the 50 pregnancies were categorized as having an insufficient placenta. Significant differences were observed between insufficient and normal placentas in mean placental thickness, area, volume, placenta to amniotic fluid SI ratio, and size of FVs (49.0 mm vs. 36.9 mm, 1.62 × 10(4) mm(2) vs. 2.67 × 10(4) mm(2), 5.13 × 10(5) mm(3) vs. 6.56 × 10(5) mm(3), 0.549 vs. 0.685, and 3.4 mm vs. 4.3 mm, respectively). The sensitivity and accuracy using globular appearance plus decreased FVs were greater than those using decreased FVs (P < 0.01). There was no significant difference among AUCs using globular appearance and decreased FVs, and globular appearance plus decreased FVs. CONCLUSIONS: Placental insufficiency was associated with placental thickness, area, volume, placenta to amniotic fluid SI ratio, and size of FVs. Evaluating FVs on T2-weighted RARE images can be useful for detecting placental insufficiency, particularly in placentas without globular appearance on MR images.


Subject(s)
Fetus/diagnostic imaging , Magnetic Resonance Imaging/methods , Placental Insufficiency/diagnostic imaging , Female , Humans , Pregnancy
13.
Magn Reson Med Sci ; 13(3): 175-81, 2014.
Article in English | MEDLINE | ID: mdl-24990469

ABSTRACT

PURPOSE: We evaluated the ability of diffusion-weighted imaging (DWI) at 3 tesla for diagnosing T stage and detecting stalks in bladder cancer. METHODS: In total, 39 consecutive patients with bladder tumors underwent magnetic resonance (MR) imaging that included T2-weighted imaging (T2WI) and DWI using a 3T MR scanner. Two radiologists interpreted T2WI plus DWI and T2WI for diagnosis of T stage and for detection of stalks. We used McNemar's test to examine differences in diagnostic performance and Fisher's exact test to evaluate differences in stalk detection frequency. RESULTS: Specificity and accuracy in differentiating T1 tumors from T2 to T4 tumors were significantly better with T2WI plus DWI (83% [20/24] and 85% [33/39]) than T2WI (50% [12/24] and 67% [26/39]; P = 0.02), and accuracy for diagnosing tumor stage was significantly better with T2WI plus DWI (82% [32/39]) than T2WI alone (59% [23/39]; P = 0.03). The observers identified stalks in 11 tumors by T2WI (48% [11/23]) and 17 by DWI (74% [17/23]) (P < 0.03). CONCLUSION: DWI at 3T was superior to T2WI for evaluating the T stage of bladder cancer, particularly in differentiating T1 tumors from those T2 or higher, and in detecting stalks of papillary bladder tumors.


Subject(s)
Diffusion Magnetic Resonance Imaging/methods , Preoperative Care/methods , Urinary Bladder Neoplasms/pathology , Urinary Bladder/pathology , Adult , Aged , Aged, 80 and over , Diagnosis, Differential , Female , Humans , Image Interpretation, Computer-Assisted/methods , Image Processing, Computer-Assisted/methods , Male , Middle Aged , Neoplasm Grading , Observer Variation , Reproducibility of Results , Sensitivity and Specificity
14.
Magn Reson Med Sci ; 13(2): 89-95, 2014.
Article in English | MEDLINE | ID: mdl-24769634

ABSTRACT

PURPOSE: We assessed the usefulness of apparent diffusion coefficients (ADCs) for solid renal tumor imaging using diffusion-weighted magnetic resonance imaging (DWI) at 3T. METHODS: This retrospective study assessed ADCs of 31 patients with renal tumors that were imaged using preoperative DWI. DWI was performed with the b values of 50, 500, and 1000 s/mm(2), using a 3T magnetic resonance imaging (MRI) system (MAGNETOM Trio, 3T, Siemens Healthcare, Erlangen, Germany). The ADC map was calculated using the b values of 50 and 1000 s/mm(2). ADCs of the different tumors were compared according to the Tukey-Kramer test. RESULTS: The tumors were diagnosed as clear cell renal cell carcinoma (RCC; n = 20), papillary RCC (n = 1), infiltrating urothelial carcinoma (UC) of the kidney (n = 4), cystic RCC (n = 1), poorly differentiated carcinoma (n = 1), and angiomyolipoma (AML; n = 4). The mean ADC of clear cell RCC was significantly higher than that of infiltrating UC of the kidney (1.423 vs. 0.931 × 10(-3) mm(2)/s; P < 0.05), and the mean ADC of AML was significantly lower than that of clear cell RCC (0.674 vs. 1.423 × 10(-3) mm(2)/s; P < 0.01). CONCLUSION: ADCs used in DWI at 3T may be useful for differentiation of different types of solid renal tumors.


Subject(s)
Diffusion Magnetic Resonance Imaging/methods , Kidney Neoplasms/pathology , Adult , Aged , Angiomyolipoma/pathology , Biopsy , Carcinoma, Renal Cell/pathology , Contrast Media , Female , Gadolinium , Gadolinium DTPA , Heterocyclic Compounds , Humans , Male , Middle Aged , Organometallic Compounds , Reproducibility of Results , Retrospective Studies
15.
Ann Noninvasive Electrocardiol ; 19(3): 285-8, 2014 May.
Article in English | MEDLINE | ID: mdl-24147830

ABSTRACT

A 72-year-old female was diagnosed as a stress-induced cardiomyopathy from apical ballooning pattern of left ventricular dysfunction without coronary artery stenosis after the mental stress. ECG showed the transient T-wave inversions after the ST-segment elevations. By the mental stress after 1 year, she showed a transient dysfunction with similar ECG changes again. T-wave inversions recovered earlier, and cardiac sympathetic dysfunction showed a lighter response corresponding to the less severe dysfunction than those after the first onset. Wellens' ECG pattern was associated with the degree of neurogenic myocardial stunning with sympathetic hyperinnervation caused by mental stress.


Subject(s)
Myocardial Stunning/physiopathology , Takotsubo Cardiomyopathy/physiopathology , 3-Iodobenzylguanidine , Aged , Earthquakes , Electrocardiography/methods , Electrophysiology/methods , Female , Humans , Iodine Radioisotopes , Life Change Events , Myocardial Stunning/complications , Myocardial Stunning/diagnostic imaging , Radionuclide Imaging , Radiopharmaceuticals , Recurrence , Stress, Psychological/complications , Stress, Psychological/physiopathology , Takotsubo Cardiomyopathy/complications , Takotsubo Cardiomyopathy/diagnostic imaging
16.
J Interv Card Electrophysiol ; 38(2): 79-84, 2013 Nov.
Article in English | MEDLINE | ID: mdl-24026966

ABSTRACT

PURPOSE: Development of atrial fibrillation (AF) is complexly associated with electrical and structural remodeling and other factors every stage of AF development. We hypothesized that P wave electrocardiography with an elevated brain natriuretic peptide (BNP) level would be associated with the progression to persistence from paroxysmal AF. METHODS: P wave electrocardiography such as a maximum P wave duration (MPWD) and dispersion by 12-leads ECG, heart/mediastinum (H/M) ratio by delayed iodine-123 metaiodobenzylguanidine scintigraphic imaging, left ventricular ejection fraction (LVEF), and left atrial dimension (LAD) by echocardiography, and plasma BNP level were measured to evaluate the electrical and structural properties and sympathetic activity in 71 patients (mean ± standard deviation, age: 67 ± 13 years, 63.4 % males) with idiopathic paroxysmal AF. RESULTS: Over a 12.9-year follow-up period, AF developed into persistent AF in 30 patients. A wider MPWD (>129 ms) (p = 0.001), wider P wave dispersion (>60 ms) (p = 0.001), LAD enlargement (>40 mm) (p = 0.001), higher BNP level (>72 pg/mL) (p = 0.002), lower H/M ratio (≤2.7) (p = 0.025), and lower LVEF (≤60 %) (p = 0.035) were associated with the progression to persistent AF, and the wide MPWD was an independently powerful predictor of the progression to persistent AF with a hazard ratio (HR) of 5.49 [95 % confidence interval (CI) 2.38-12.7, p < 0.0001] after adjusting for potential confounding variables, such as age and sex. The combination of wide MPWD and elevated BNP level was additive and incremental prognostic power with 13.3 [2.16-13, p < 0.0001]. CONCLUSION: The wide MPWD with elevated BNP level was associated with the progression to persistent AF.


Subject(s)
Atrial Fibrillation/blood , Atrial Fibrillation/diagnosis , Electrocardiography/statistics & numerical data , Heart Atria/diagnostic imaging , Natriuretic Peptide, Brain/blood , Stroke Volume , Aged , Atrial Fibrillation/epidemiology , Biomarkers/blood , Chronic Disease , Disease Progression , Disease-Free Survival , Echocardiography/statistics & numerical data , Female , Follow-Up Studies , Humans , Incidence , Japan/epidemiology , Male , Middle Aged , Organ Size , Prevalence , Reproducibility of Results , Risk Assessment , Sensitivity and Specificity
17.
Am J Cardiol ; 112(5): 688-93, 2013 Sep 01.
Article in English | MEDLINE | ID: mdl-23711805

ABSTRACT

Atrial fibrillation (AF) can be a potentially life-threatening arrhythmia when it conducts rapidly through the accessory pathway, which was not predicted by the noninvasive method. We evaluated the cardiac sympathetic activity for predicting the occurrence of AF in patients with Wolff-Parkinson-White (WPW) syndrome. Iodine-123 metaiodobenzylguanidine scintigraphy was performed under stable sinus rhythm conditions at rest <1 week before an electrophysiologic study (EPS) to assess the sympathetic activity using the heart/mediastinum (H/M) ratio in 45 consecutive patients with WPW who had a history of supraventricular tachycardia (mean ± SD, age: 47 ± 17 years, 42.2% women). The study also included 15 normal healthy volunteers (56 ± 17 years, 40% women). The H/M ratio was lower in patients with WPW syndrome than in the normal control group, and in the 15 patients with AF induced during EPS than in the 30 patients without AF (p <0.0001). The sensitivity of H/M ratio ≤2.8 for predicting the AF induced during EPS was 75% in 12 of 16 patients, and the specificity was 89.7% in 26 of 29 patients. The H/M ratio was positively correlated with anterograde effective refractory period (r = 0.514, p <0.0001). The sensitivity of H/M ratio ≤2.75 for predicting the AF with a short anterograde effective refractory period (≤250 ms) was 91.7% in 11 of 12 patients, and the specificity was 90.9% in 30 of 33 patients. In conclusion, the severe cardiac sympathetic dysfunction was associated with the occurrence of AF, particularly in those with rapid AF and in patients with WPW syndrome.


Subject(s)
Atrial Fibrillation/diagnostic imaging , Heart/innervation , Mediastinum/diagnostic imaging , Sympathetic Nervous System/diagnostic imaging , Tachycardia, Supraventricular/diagnostic imaging , Wolff-Parkinson-White Syndrome/diagnostic imaging , 3-Iodobenzylguanidine , Adult , Aged , Atrial Fibrillation/complications , Case-Control Studies , Electrophysiologic Techniques, Cardiac , Female , Heart/diagnostic imaging , Humans , Male , Middle Aged , Myocardial Perfusion Imaging , Radiopharmaceuticals , Severity of Illness Index , Sympathetic Nervous System/physiopathology , Tachycardia, Supraventricular/complications , Wolff-Parkinson-White Syndrome/complications
19.
Clin Imaging ; 36(5): 526-31, 2012.
Article in English | MEDLINE | ID: mdl-22920357

ABSTRACT

PURPOSE: To investigate the diagnostic accuracy of 3.0-T diffusion-weighted imaging (DWI) for detection of prostate cancer by using different b-values. METHODS: Seventy-three patients underwent magnetic resonance imaging (MRI) at 3.0 T. Three MRI sets were reviewed by two radiologists: MRI and DWI (b = 500 s/mm(2)) (protocol A), MRI and DWI (b = 1000 s/mm(2)) (protocol B), and MRI and DWI (b = 2000s/mm(2)) (protocol C). Areas under the receiver operating characteristic curve (AUCs) were calculated. RESULTS: The mean of the AUCs in protocol C was larger than those in protocol A and in protocol B (P<.05). CONCLUSION: DWI (b = 2000s/mm(2)) at 3.0 T can improve the diagnostic accuracy for detection of prostate cancer.


Subject(s)
Diffusion Magnetic Resonance Imaging/methods , Prostatic Neoplasms/diagnosis , Aged , Biopsy , Diagnosis, Differential , Humans , Male , Prostate-Specific Antigen/blood , Prostatic Neoplasms/pathology , ROC Curve , Retrospective Studies
20.
Circ Cardiovasc Imaging ; 4(5): 524-31, 2011 Sep.
Article in English | MEDLINE | ID: mdl-21778328

ABSTRACT

BACKGROUND: Left atrial (LA) remodeling is a factor in atrial fibrillation (AF) recurrence after pulmonary vein catheter ablation (CA), but right atrium (RA) remodeling has not been investigated for possible associations to AF recurrence. METHODS AND RESULTS: Using 64-slice multidetector computed tomography, RA and LA volumes were measured 3-dimensionally before CA in 65 patients with initially proven idiopathic paroxysmal AF (mean age, 60±10 years, 81.5% men). The CA procedure was guided by CARTO Merge atrial electroanatomic mapping. Sixteen patients (24.6%) had AF recurrence within the 6-month period after the CA. The recurrence was associated with a large RA volume [odds ratio, 1.04; 95% confidence interval (CI), 1.02 to 1.07, P<0.0001], a large LA volume with 1.04 [95% CI, 1.01 to 1.06, P=0.002], and low LA mean voltage with 1.03 [95% CI, 1.01 to 1.05, P=0.002]. After adjustment for potential confounding variables, RA and LA volumes remained predictive of AF recurrence. Large atrial volumes (mL) (RA ≥87 or LA ≥99) predicted AF recurrence (sensitivity of RA volume: 81.3% in 13 of 16 patients with AF recurrence; specificity: 75.5% in 37 of 49 patients without AF recurrence; sensitivity of LA volume: 81.3% in 13 of 16 patients with AF recurrence; specificity: 69.4% in 34 of 49 patients without AF recurrence), and the combined estimate of both atrial volumes was incremental and additive prognostic power (sensitivity: 75% in 12 of 16 patients with AF recurrence; specificity: 93.9% in 46 of 49 patients without AF recurrence). CONCLUSIONS: Both LA and RA remodeling are equally associated with post-CA AF recurrence.


Subject(s)
Atrial Fibrillation/physiopathology , Atrial Function, Left/physiology , Atrial Function, Right/physiology , Catheter Ablation , Heart Conduction System/surgery , Pulmonary Veins/surgery , Tachycardia, Paroxysmal/physiopathology , Atrial Fibrillation/diagnostic imaging , Atrial Fibrillation/surgery , Electrocardiography, Ambulatory , Female , Follow-Up Studies , Heart Atria/diagnostic imaging , Heart Atria/innervation , Heart Atria/physiopathology , Humans , Male , Middle Aged , Pilot Projects , Recurrence , Tachycardia, Paroxysmal/diagnostic imaging , Tachycardia, Paroxysmal/surgery , Tomography, X-Ray Computed
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