Comparison of MRI Sequences for the Detection of Cerebral Venous Sinus Thrombosis During Follow-Up Examination

PURPOSE@#To compare the diagnostic performance of magnetic resonance (MR) sequences for the evaluation of cerebral venous sinus thrombosis (CVST) during follow-up examinations.@*MATERIALS AND METHODS@#Thirteen cases that were confirmed to be CVST between January 2006 and March 2016 were included in this study. Two neuroradiologists independently examined each initial and follow-up MR sequence image in random order.@*RESULTS@#Gadolinium-enhanced T1-weighted imaging (Gd-enhanced T1WI) was the most sensitive sequence for the detection of CVST in the initial and follow-up MR examinations (82% and 55.3%, respectively). Among the non-enhanced MR sequences of the initial examination, gradient-recalled echo was the most sensitive (77.4%), fluid-attenuated inversion recovery (FLAIR) had low sensitivity (34.4%). The overall diagnostic performances of all MR sequences except for FLAIR decreased during the follow-up. FLAIR was the most sensitive during follow-up, and was also the only sequence with increased sensitivity during follow-up (from 34.4% to 55.6%).@*CONCLUSION@#Gd-enhanced T1WI had the best diagnostic performance for CVST in both initial and follow-up MR examinations. Therefore, it is reasonable to use Gd-enhanced T1WI to evaluate CVST during follow-up examinations. However, for patients who cannot tolerate MR contrast agents, the use of FLAIR to assess the remaining CVST during the follow-up may be helpful.

Development of Coronary Vasospasm during Adenosine-Stress Myocardial Perfusion CT Imaging

Adenosine is a short-acting coronary vasodilator, and it is widely used during pharmacological stress myocardial perfusion imaging. It has a well-established safety profile, and most of its side effects are known to be mild and transient. Until now, coronary vasospasm has been rarely reported as a side effect of adenosine during or after adenosine stress test. This study reports a case of coronary vasospasm which was documented on stress myocardial perfusion CT imaging during adenosine stress test.

A Case Report: Cavitary Infarction Caused by Pulmonary Tumor Thrombotic Microangiopathy in a Patient with Pancreatic Intraductal Papillary Mucinous Neoplasm

Pulmonary tumor embolism is commonly discovered at autopsy, but is rarely suspected ante-mortem. Microangiopathy is an uncommon and distinct form of simple tumor pulmonary embolism. Here, we present a 52-year-old male with tumor thrombotic microangiopathy and pulmonary infarction, which might have originated from intraductal papillary mucinous tumor of the pancreas. Multiple wedge-shaped consolidations were found initially and aggravated with cavitation. These CT features of pulmonary infarction were pathologically confirmed to result from pulmonary tumor thrombotic microangiopathy.

Role of Prostate Volume in the Early Detection of Prostate Cancer in a Cohort with Slowly Increasing Prostate Specific Antigen

PURPOSE: To investigate the relationship between prostate volume and the increased risk for being diagnosed with prostate cancer (PCa) in men with slowly increasing prostate specific antigen (PSA). MATERIALS AND METHODS: A cohort of 1035 men who visited our hospital's health promotion center and were checked for serum PSA levels more than two times between January 2001 and November 2011 were included. Among them, 116 patients had a change in PSA levels from less than 4 ng/mL to more than 4 ng/mL and underwent transrectal ultrasound guided prostate biopsy. Median age was 55.9 years and 26 (22.4%) had PCa. We compared the initial PSA level, the last PSA level, age, prostate volume, PSA density (PSAD), PSA velocity, and follow-up period between men with and without PCa. The mean follow-up period was 83.7 months. RESULTS: Significant predictive factors for the detection of prostate cancer identified by univariate analysis were prostate volume, follow-up period and PSAD. In the multivariate analysis, prostate volume (p<0.001, odds ratio: 0.890) was the most significant factor for the detection of prostate cancer. In the receiver operator characteristic curve of prostate volume, area under curve was 0.724. At the cut-off value of 28.8 mL for prostate volume, the sensitivity and specificity were 61.1% and 73.1% respectively. CONCLUSION: In men with PSA values more than 4 ng/mL during the follow-up period, a small prostate volume was the most important factor in early detection of prostate cancer.

A Case of Enterovirus 71 Infection Presented with Acute Flaccid Paralysis / 대한소아신경학회지

Hand-foot-mouth disease (HFMD) is characterized by distinctive skin lesions on the hand, foot, and mouth and in general, recovery occurs within one week. However, in cases of HFMD by enterovirus 71 (EV71) infection, the development of neurologic complications such as brainstem encephalitis, acute flaccid paralysis, and aseptic meningitis has been common. Moreover, it has been reported that some patients with neuologic complications have expired in severe cases. Here, we report a case of EV71 infection presented with acute flaccid paralysis of a single similar to paralytic poliomyelitis.

Abnormal Motion of the Interventricular Septum after Coronary Artery Bypass Graft Surgery: Comprehensive Evaluation with MR Imaging

OBJECTIVE: To define the mechanism associated with abnormal septal motion (ASM) after coronary artery bypass graft surgery (CABG) using comprehensive MR imaging techniques. MATERIALS AND METHODS: Eighteen patients (mean age, 58 +/- 12 years; 15 males) were studied with comprehensive MR imaging using rest/stress perfusion, rest cine, and delayed enhancement (DE)-MR techniques before and after CABG. Myocardial tagging was also performed following CABG. Septal wall motion was compared in the ASM and non-ASM groups. Preoperative and postoperative results with regard to septal wall motion in the ASM group were also compared. We then analyzed circumferential strain after CABG in both the septal and lateral walls in the ASM group. RESULTS: All patients had normal septal wall motion and perfusion without evidence of non-viable myocardium prior to surgery. Postoperatively, ASM at rest and/or stress state was documented in 10 patients (56%). However, all of these had normal rest/stress perfusion and DE findings at the septum. Septal wall motion after CABG in the ASM group was significantly lower than that in the non-ASM group (2.1+/-5.3 mm vs. 14.9+/-4.7 mm in the non-ASM group; p < 0.001). In the ASM group, the degree of septal wall motion showed a significant decrease after CABG (preoperative vs. postoperative = 15.8+/-4.5 mm vs. 2.1+/-5.3 mm; p = 0.007). In the ASM group after CABG, circumferential shortening of the septum was even larger than that of the lateral wall (-20.89+/-5.41 vs. -15.41+/-3.7, p < 0.05) CONCLUSION: Abnormal septal motion might not be caused by ischemic insult. We suggest that ASM might occur due to an increase in anterior cardiac mobility after incision of the pericardium.

High-Resolution Diffusion Tensor MR Imaging for Evaluating Myocardial Anisotropy and Fiber Tracking at 3T: the Effect of the Number of Diffusion-Sensitizing Gradient Directions

OBJECTIVE: We wanted to evaluate the effect of the number of diffusion-sensitizing gradient directions on the image quality for evaluating myocardial anisotropy and fiber tracking by using in vitro diffusion tensor MR imaging (DT-MRI). MATERIALS AND METHODS: The DT-MR images, using a SENSE-based echoplanar imaging technique, were acquired from ten excised porcine hearts by using a 3T MR scanner. With a b-value of 800 s/mm2, the diffusion tensor images were obtained for 6, 15 and 32 diffusion-sensitizing gradient directions at the midventricular level. The number of tracked fibers, the fractional anisotropy (FA), and the length of the tracked fibers were measured for the quantitative analysis. Two radiologists assessed the image quality of the fiber tractography for the qualitative analysis. RESULTS: By increasing the number of diffusion-sensitizing gradient directions from 6 to 15, and then to 32, the FA and standard deviation were significantly reduced (p < 0.01), and the number of tracked fibers and the length of the tracked fibers were significantly increased (p < 0.01). The image quality of the fiber tractography was significantly increased with the increased number of diffusion-sensitizing gradient directions (p < 0.01). CONCLUSION: The image quality of in vitro DT-MRI is significantly improved as the number of diffusion-sensitizing gradient directions is increased.

Endovascular Treatment of Large Mycotic Aneurysm in Cavernous Internal Carotid Artery : A Case Report / 신경중재치료의학

Intracranial mycotic aneurysms are secondary to infectious endocarditis, meningoencephalitis, cavernous sinus thrombophlebitis, sinusitis, and bacteremia. Usually mycotic aneurysms are arising on distal cerebral vessels, but rarely on internal carotid artery. We experienced mycotic aneurysm of ICA followed by meningoencephalitis and thrombophlebitis in both cavernous sinuses. We observed occurrence of mycotic aneurysm by sequential image, and good result after endovascular treatment. So we present our case.

The Usefulness of the Computed Tomography for Diagnosing DeepVenous Thrombosis of the Lower Extremities

PURPOSE: This study aims to access the usefulness of indirect computed tomographic venography (CTV) after performing computed tomographic pulmonary angiography (CTPA) to detect deep venous thrombosis. METHODS: Eighty six patients who were diagnosed with deep venous thrombosis (DVT) were retrospectively enrolled in this study. All the patients had CTPA & CTV performed within 24 hours after Doppler ultrasound (US). The CTV was compared with Doppler US for their ability to diagnose DVT. Pulmonary embolism (PE) and other findings that were detected by CTPA & CTV were analyzed. RESULTS: Among 86 patients, 83 had thrombi detected by Doppler US. CTV did not detect DVT in 11 of the 83 patients. Among the 11 patients, 8 had below the knee thrombosis, which was not in the scan area of CTV. In 2 patients, their Doppler US results could not be guaranteed. One case was a false positive result on Doppler US. The results for determining the thrombi level between Doppler US and CTV were roughly concordant. In addition to DVT or PE, 32 new lesions in 27 patients were incidentally detected by CTPA & CTV. CONCLUSION: Compared with Doppler US, CTPA & CTV are not inferior to detect DVT of the lower extremities and these modalities can also provide information about incidental disease, as well as pulmonary embolism.

A Case of Constrictive Pericarditis Associated With Huge Epicardial Fat Volume

Massive deposits of fat around heart are seen in overweight persons and are associated with coronary artery disease. Investigators have focused on the clinical significance of epicardial fat with respect to metabolic effects such as insulin resistance and inflammation, but the mechanical effects, such as constriction, have been largely ignored. We present an unusual case of a 59-year-old woman with obesity and diabetes mellitus who had been undergoing peritoneal dialysis due to end-stage renal disease, and who developed constrictive pericarditis, possibly secondary to extensive epicardial fatty accumulation.

Ultrasonographic Findings of Aspergillus Bursitis in a Patient with a Renal Transplantation: A Case Report

Aspergillus bursitis is an uncommon condition demonstrated as a nonspecific soft tissue mass. To our knowledge, the ultrasonographic findings of aspergillus bursitis in immunocompromised patients have not been previously reported. Here, we report a case of aspergillus bursitis in a renal transplant recipient, accompanied by the associated ultrasonographic findings.

A Case of Ruptured Ovarian Cyst in a Newborn

Ovarian cysts are the most common cystic abdominal masses in female newborns. It is believed to be derived from an overstimulation of the ovarian follicles by maternal, placental, and fetal hormones. Although most ovarian cysts resolve spontaneously, surgical management is mandatory for life-threatening, complicated cases, including torsion, intracystic hemorrhage, and rupture of the cyst. Rupture of ovarian cysts is thought to be exceedingly rare, but can lead to severe hemorrhagic ascites or peritonitis. We managed a case of a ruptured ovarian cyst in a female newborn who presented with mild abdominal distension and two episodes of gross hematuria. Exploratory laparotomy revealed a right ovarian cyst with torsion and rupture. She was successfully treated with a right salpingo-oophorectomy with no sequelae.

Pituitary Carcinoma with Mandibular Metastasis: A Case Report

Pituitary carcinomas are rare primary adenohypophyseal tumors with cerebrospinal or extracranial metastasis. The present case, the first report of the disease in Korea, involved a 36-yr-old woman who presented with a 3-week history of headache. Brain magnetic resonance imaging revealed a 2.5-cm sellar and suprasellar mass showing heterogeneous enhancement with suspicious invasion of both cavernous sinuses. The patient underwent gross-total resection. The tumor cells were composed of polygonal cells singly or in variable-sized nests. The nuclei were large and round with prominent nucleoli. The cytoplasms was acidophilic and granular. Marked pleomorphism and frequent mitoses (3 per 10 HPFs) were found. By immunohistochemistry, tumor cells were strongly positive for prolactin, but negative for ACTH and GH. Additional immunostainings for cytokeratin, vimentin, and glial fibrillary acidic protein (GFAP) were negative. After the surgery, the patient received radiotherapy because of the atypical histologic features. The prolactin level fell from 123.17 ng/mL to 5.17 ng/mL after surgery. Nine months after the initial diagnosis, the patient died from mandibular metastasis associated with the pituitary carcinoma.

Factors Affecting Resident Physician's Underreporting Behavior of Needle Stick Injuries in a Tertiary Teaching Hospital

Background: The most frequent hospital-related work injury is needle stick injury (NSI) that is likely to be experienced by most of the trainees during their residency, but not reported. Physicians under residency training were surveyed to identify the factors associated with non-reporting behavior of NSI according to health belief model. Methods: We surveyed 463 residents in a tertiary care teaching hospital in South Korea. A questionnaire on experiencing NSI, reporting behavior and the reasons for reporting behavior as done and collected between June and July 2004 via hospital groupware, AMCnet. The questionnaire was based on health belief model. Results: The e-mail questionnaire survey was received by 322 resident physicians and was completed by 43.8% (141). Among the responders, 88.7% (125) answered to have experienced needle stick injuries, and only 40% (50) had ever reported the incidence of NSI. The years of training, the infectivity of the patient in whom the needle was used, reporting mechanism or requirement and efficacy expectation were statistically significant factors for non-reporting behavior. Conclusion: The majority of the resident physicians did not report their NSI, and the variables affecting their underreporting behavior were evaluated by the health belief model. From this study, we learned that as the susceptibility of infection, the knowledge of reporting requirement and mechanism, and their expectation for the efficacies of reporting were higher, the reporting rate of their needle stick injury was likely to be higher as well.

A Case of Telangiectatic Focal Nodular Hyperplasia of the Liver in a Newborn

Telangiectatic focal nodular hyperplasia (FNH) denotes atypical lesions considered as variants of FNH. FNH of the liver is characterized by stellate central scars with dysplastic vessels and hyperplastic nodules. It is the second most common benign hepatic tumor following hemangioma. However, telangiectatic FNH is extremely rare in the perinatal period and only three cases were reported in the literature. We recently experienced a case of telangiectatic FNH in a newborn. This lesion was detected on the prenatal ultrasonographic examination performed at the 36th weeks of gestation, and confirmed by the right lobectomy after birth. We report this case with a brief review of the literature.

Numerous Bilateral Radiographically Dense Branching Opacities after Vertebroplasty with Polymethylmethacrylate / 결핵및호흡기질환

Percutaneous vertebroplasty consists of the percutaneous injection of polymethylmethacrylate (PMMA) cement into a collapsed vertebral body in order to obtain pain relief and mechanically strengthen the vertebral body. This procedure is now extensively used in treating osteoporotic vertebral compression fracture. It is an efficient treatment, but it is not free of complications. Most complications after vertebroplasty are associated with PMMA leakage. Pulmonary embolism of PMMA is rare, but this can occur when there is a failure to recognize venous migration of cement early during the procedure. We encountered a case of a patient with asymptomatic pulmonary embolism because of PMMA after percutaneous vertebroplasty. Chest X-ray and CT scanning revealed numerous tubular branching opacities that corresponded to the pulmonary vessels at the segmental and subsegmental levels.

US Guided Fine-needle Non-suction Technique: A Useful and Comfortable Method for Thyroid Nodule

as useful as the conventional suction technique for the cytopathological evaluation of thyroid nodules.

Clinical Characteristics, Diagnosis, Treatment, and Clinical Outcomes of TB Patients at a Private University Hospital in Korea

BACKGROUND: Even though tuberculosis (TB) is still a major public concern in Korea, there are few data on the management of TB patients and its outcome in the private sector in contrast with those of the public sector. METHODS: The nine-hundred-twelve TB patients who were registered in a private university hospital from 2001 to 2002 were enrolled. The patients were divided into pulmonary (TB(P)), extrapulmonary (TB(E)), and combined (TB(P+E)) groups, and were also divided into initial and retreatment groups. The clinical characteristics, diagnostic methods, treatment regimens, and outcomes were analyzed and compared between the groups. RESULTS: The mean age of 912 patients was 49.2 years and the male-to-female ratio was 56%:44%. The number of patients of the initial and retreatment groups of TB(P), and those of (TB(E)+TB(P)+E) were 449, 169, 237, 57, respectively. The bacteriological study was performed in 97.9%, and positive culture was confirmed in 54.5% and 29.6% of patients with TB(P) and (TB(E)+TB(P)+E), respectively (P<0.05). The AFB smear was positive in 40.8% of TB(P) patients. The PCR was done in 63.6% of (TB(E)+TB(P)+E) group. The MDR was detected in 7.6% of isolates. Overall, treatment completion rate was 74.6%, default rate 13.7%, and death rate 0.5%. CONCLUSION: Even though the management of TB patients in a private hospital was satisfactory in terms of national guidelines, the high default rate was still a problem. Efforts to decrease the default rate is needed independently or in cooperation with the public sector.

Coronary Angiography with Multidetector row Computed Tomography: Part I - Technical Aspects

Various invasive and non-invasive imaging techniques have been used for the diagnosis of cardiac disease. The recently introduced multidetector row CT (MDCT) shows rapid scan speed, high temporal resolution and large volume coverage in a single breath-hold. MDCT opens a new horizon for cardiac imaging because noninvasive coronary artery imaging has become feasible using MDCT. In this article, we illustrate the technical aspects of coronary CT angiography using MDCT.

Multi-Slice Spiral CT of Living-Related Liver Transplantation in Children: Pictorial Essay

In pediatric living-related liver transplantation, preoperative evaluation of the recipient is important for surgical planning, while the accurate diagnosis of postoperative complications is essential for graft salvage. Multiplanar and three-dimensional imaging using multi-slice spiral CT can be used for preoperative vascular imaging, as well as for evaluating postoperative complications. In this essay, we describe the usefulness of multi-slice CT, combined with a variety of different reconstruction techniques, for the preoperative evaluation of transplant recipients. In addition, we demonstrate the multi-slice CT findings of postoperative complications, including vascular stenosis or thrombosis, bile duct leak or stricture, and extrahepatic fluid collection.