Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 75
Filter
1.
Yonsei Medical Journal ; : 259-264, 2022.
Article in English | WPRIM | ID: wpr-927155

ABSTRACT

Purpose@#Neuroinflammation is considered an important pathway associated with several diseases that result in cognitive decline. 18F-THK5351 positron emission tomography (PET) signals might indicate the presence of neuroinflammation, as well as Alzheimer’s disease-type tau aggregates. β-amyloid (Aβ)-negative (Aβ–) amnestic mild cognitive impairment (aMCI) may be associated with non-Alzheimer’s disease pathophysiology. Accordingly, we investigated associations between 18F-THK5351 PET positivity and cognitive decline among Aβ– aMCI patients. @*Materials and Methods@#The present study included 25 amyloid PET negative aMCI patients who underwent a minimum of two follow-up neuropsychological evaluations, including clinical dementia rating-sum of boxes (CDR-SOB). The patients were classified into two groups: 18F-THK5351-positive and -negative groups. The present study used a linear mixed effects model to estimate the effects of 18F-THK5351 PET positivity on cognitive prognosis among Aβ– aMCI patients. @*Results@#Among the 25 Aβ– aMCI patients, 10 (40.0%) were 18F-THK5351 positive. The patients in the 18F-THK5351-positive group were older than those in the 18F-THK5351-negative group (77.4±2.2 years vs. 70.0±5.5 years; p<0.001). There was no difference between the two groups with regard to the proportion of apolipoprotein E ε4 carriers. Interestingly, however, the CDR-SOB scores of the 18F-THK5351-positive group deteriorated at a faster rate than those of the 18F-THK5351-negative group (B=0.003, p=0.033). @*Conclusion@#The results of the present study suggest that increased 18F-THK5351 uptake might be a useful predictor of poor prognosis among Aβ– aMCI patients, which might be associated with increased neuroinflammation (ClinicalTrials.gov NCT02656498).

2.
Article in English | WPRIM | ID: wpr-925505

ABSTRACT

Purpose@#Malignant intraductal papillary neoplasm of the bile duct of the liver (IPNB-L) cannot readily be diagnosed through preoperative CT or MRI, but fluorodeoxyglucose (FDG)-PET is a viable alternative. This study evaluated the diagnostic and prognostic impacts of FDG-PET in patients with IPNB-L. @*Methods@#This was a retrospective single-center study of 101 IPNB-L patients who underwent hepatectomy between 2010 and 2019. @*Results@#Mean age was 64.4 ± 8.3 years and 76 (75.2%) were male. Anatomical hepatic resection was performed in 99 (98.0%). Concurrent bile duct resection and pancreaticoduodenectomy were performed in 41 (40.6%) and 1 (1.0%), respectively. R0 and R1 resections were performed in 88 (87.1%) and 13 (12.9%), respectively. Low-grade intraepithelial neoplasia and high-grade neoplasia/invasive carcinoma were diagnosed in 19 (18.8%) and 82 (81.2%), respectively. Median FDG-PET maximal standardized uptake values (SUVmax) in low-grade neoplasia and high-grade neoplasia/carcinoma were 3.6 (range, 1.7–7.6) and 5.2 (range, 1.5–18.7) (P = 0.019), respectively. Receiver operating characteristic curve analysis of SUVmax showed area under the curve of 0.674, with sensitivity of 84.2% and specificity of 47.4% at SUVmax cutoff of 3.0. This cutoff had no significant influence on tumor recurrence (P = 0.832) or patient survival (P = 0.996) in patients with IPNB-L of high-grade neoplasia or invasive carcinoma. @*Conclusion@#IPNB-L is a rare type of biliary neoplasm and encompasses a histological spectrum ranging from benign disease to invasive carcinoma. An FDG-PET SUVmax cutoff of 3.0 appears to effectively discern high-grade neoplasia/ carcinoma from low-grade neoplasia, which will assist with the surgical strategy for these cases.

3.
Article in English | WPRIM | ID: wpr-918315

ABSTRACT

We investigated whether β-carotene (β-CA) or ellagic acid (EA), originating from various fruits and vegetables, has a preventive effect against male infertility induced by exogenous scrotal hyperthermia. ICR adult mice were intraperitoneally treated with 10 mg/kg of β-CA or EA daily for 13 days consecutively. During this time, mice were subjected to transient scrotal heat stress in a water bath at 43℃ for 20 min on day 7, and their testes and blood were obtained on day 14 for histopathologic and biochemical analyses. Heat stress induced significant testicular weight reduction, germ cell loss and degeneration, as well as abnormal localization of phospholipid hydroperoxide glutathione peroxidase (PHGPx) and manganese superoxide dismutase (MnSOD) in spermatogenic and Leydig cells. Heat stress also altered the levels of oxidative stress (lipid peroxidation, SOD activity, and PHGPx, MnSOD, and HIF-1α mRNAs), apoptosis (Bax, Bcl-xL, caspase 3, NF-κB, and TGF-β1 mRNAs), and androgen biosynthesis (serological testosterone concentration and 3β-hydroxysteroid dehydrogenase mRNA) in testes. These changes were all improved significantly by β-CA treatment, but only slightly improved by EA treatment. These findings indicate that β-CA, through modulations of oxidative stress, apoptosis, and androgen biosynthesis, is a potent preventive agent against testicular injuries induced by scrotal hyperthermia.

4.
Article in English | WPRIM | ID: wpr-786487

ABSTRACT

We present the case of a patient with biliary and duodenal atresia who showed false-negative hepatobiliary scintigraphy results. The patient was born at 37 weeks and 2 days of gestation. Her mother had undergone amnioreduction after detection of a double-bubble ultrasound sign in the fetal abdomen. At 2 days of age, total serum bilirubin level was elevated. On hepatobiliary scintigraphy 4 days later, the gallbladder was visualized from 30 min and it showed duodeno-gastric reflux at 240 min. After 24 h, the radiotracer was almost washed out in the hepatic parenchyma, but there was retention in the gastroduodenal junction. Because the biliary to duodenal transit was visible, biliary atresia seemed unlikely. Abdominal ultrasonography at 7 days of age showed a small dysmorphic gallbladder, but triangular cord sign was not definite. Magnetic resonance cholangiography revealed atretic gallbladder. Although cystic and common bile ducts were visible, the proximal common hepatic bile duct was not visible. The next day, serum total bilirubin levels remained elevated (17.1 mg/dl) with direct bilirubin level of 1.2 mg/dl. Kasai portoenterostomy with duodeno-duodenostomy was performed at 10 days of age. Histopathological evaluation showed a fibrous obliteration of the common bile duct, consistent with that of biliary atresia.


Subject(s)
Abdomen , Bile Ducts , Biliary Atresia , Bilirubin , Cholangiography , Common Bile Duct , Duodenogastric Reflux , Gallbladder , Humans , Infant, Newborn , Jaundice, Neonatal , Mothers , Pregnancy , Radionuclide Imaging , Ultrasonography
5.
Article in English | WPRIM | ID: wpr-719302

ABSTRACT

BACKGROUND AND PURPOSE: Semantic memory remains more stable than episodic memory across the lifespan, which makes it potentially useful as a marker for distinguishing pathological aging from normal senescence. To obtain a better understanding of the transitional stage evolving into Alzheimer's dementia (AD), we focused on the amnestic mild cognitive impairment (aMCI) stage stratified based on β-amyloid (Aβ) pathology. METHODS: We analyzed the raw data from Korean version of the Boston Naming Test (K-BNT) and the Controlled Oral Word Association Test (COWAT). For K-BNT, the frequencies of six error types and accuracy rates were evaluated. For a qualitative assessment of the COWAT, we computed the number of switching, number of clusters, and mean cluster size. RESULTS: The data from 217 participants were analyzed (53 normal controls, 66 with Aβ− aMCI, 56 with Aβ+ aMCI, and 42 disease controls). There were fewer semantically related errors and more semantically unrelated errors on the K-BNT in Aβ+ aMCI than in Aβ− aMCI, without a gross difference in the z score. We also found that Aβ+ aMCI showed a more prominent deficit in the number of clusters in the semantic fluency task [especially for animal names (living items)] than Aβ− aMCI. CONCLUSIONS: In spite of similar clinical manifestations, Aβ+ aMCI was more similar to AD than Aβ− aMCI in terms of semantic memory disruption. Semantic memory may serve as an early indicator of brain Aβ pathology. Therefore, semantic memory dysfunction deserves more consideration in clinical practice. Longitudinal research with the follow-up data is needed.


Subject(s)
Aging , Alzheimer Disease , Animals , Brain , Dementia , Follow-Up Studies , Humans , Memory , Memory, Episodic , Cognitive Dysfunction , Pathology , Semantics , Word Association Tests
6.
Article in English | WPRIM | ID: wpr-760354

ABSTRACT

We investigated whether β-carotene (β-CA) or ellagic acid (EA), originating from various fruits and vegetables, has a preventive effect against male infertility induced by exogenous scrotal hyperthermia. ICR adult mice were intraperitoneally treated with 10 mg/kg of β-CA or EA daily for 13 days consecutively. During this time, mice were subjected to transient scrotal heat stress in a water bath at 43℃ for 20 min on day 7, and their testes and blood were obtained on day 14 for histopathologic and biochemical analyses. Heat stress induced significant testicular weight reduction, germ cell loss and degeneration, as well as abnormal localization of phospholipid hydroperoxide glutathione peroxidase (PHGPx) and manganese superoxide dismutase (MnSOD) in spermatogenic and Leydig cells. Heat stress also altered the levels of oxidative stress (lipid peroxidation, SOD activity, and PHGPx, MnSOD, and HIF-1α mRNAs), apoptosis (Bax, Bcl-xL, caspase 3, NF-κB, and TGF-β1 mRNAs), and androgen biosynthesis (serological testosterone concentration and 3β-hydroxysteroid dehydrogenase mRNA) in testes. These changes were all improved significantly by β-CA treatment, but only slightly improved by EA treatment. These findings indicate that β-CA, through modulations of oxidative stress, apoptosis, and androgen biosynthesis, is a potent preventive agent against testicular injuries induced by scrotal hyperthermia.


Subject(s)
Adult , Animals , Apoptosis , Baths , beta Carotene , Caspase 3 , Ellagic Acid , Fever , Fruit , Germ Cells , Glutathione Peroxidase , Hot Temperature , Humans , Hydrogen Peroxide , Infertility, Male , Leydig Cells , Male , Mice , Oxidative Stress , Oxidoreductases , Superoxide Dismutase , Testis , Testosterone , Vegetables , Water , Weight Loss
7.
Article in English | WPRIM | ID: wpr-916658

ABSTRACT

Although bimaxillary surgery enhances patients' self-esteem and mood by improving their facial appearance, surgical outcome assessments for this procedure are limited. This preliminary study investigated differences in brain activity on functional magnetic resonance imaging (fMRI) during self-face evaluation before and after bimaxillary surgery. Three patients (1 man and 2 women, age range: 20–27 years) underwent fMRI while viewing self-face images before and after bimaxillary surgery for maxillofacial deformity. The activation in the left postcentral gyrus, and medial orbital frontal cortex was significantly great in response to after-surgery self-face images compared to before-surgery images. Our preliminary results may facilitate the development of an objective measure for patient satisfaction after orthognathic surgery including bimaxillary surgery.

8.
Article in English | WPRIM | ID: wpr-786955

ABSTRACT

PURPOSE: Dopamine transporter imaging is suggested to be a useful imaging biomarker for Parkinson's disease (PD) progression and monitoring drug effects.We investigated the longitudinal decline characteristics of striatal [¹⁸F]FP-CIT uptake in PD.METHODS: We retrospectively reviewed 35 PD patients and 9 non-PD patients. All patients underwent [¹⁸F]FP-CIT PET at the initial diagnosis and follow-up. PET images were spatially normalized and analyzed with eight striatal and one occipital VOI templates. We measured the specific to non-specific binding ratio (SNBR) of the striatal subregions and calculated the absolute annual reduction (AAR) and relative annual reduction (%RAR) of the SNBRs.RESULTS: Total striatal SNBRs in PD patients were significantly lower than those in non-PD patients, with the most significant difference in the posterior putamen. Both AAR (0.26 ± 0.14 vs. 0.09 ± 0.19, p < 0.05) and %RAR (6.9 ± 3.5 vs. 1.2 ± 2.7, p < 0.001) of total striatal SNBRs were significantly greater in PD than non-PD patients. There were no significant differences in the AAR and %RAR of total striatal SNBRs between elderly and young onset PD. The AARs of the posterior putamen were higher in early PD than in advanced PD. Conversely, the %RARs were not significantly different between early and more advanced PD. The disease duration was significantly negatively correlated with the AAR but not with the %RAR of the posterior putamen.CONCLUSIONS: The longitudinal decline of striatal [¹⁸F]FP-CIT uptake in PD was nonlinear and significantly faster than that in non-PD, with a different rate of decline among the striatal subregions.


Subject(s)
Aged , Diagnosis , Dopamine Plasma Membrane Transport Proteins , Follow-Up Studies , Humans , Parkinson Disease , Putamen , Retrospective Studies
9.
Article in English | WPRIM | ID: wpr-120931

ABSTRACT

Human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) may be a promising modality for treating medial temporal lobe epilepsy. 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) is a noninvasive method for monitoring in vivo glucose metabolism. We evaluated the efficacy of hUCB-MSCs transplantation in chronic epileptic rats using FDG-PET. Rats with recurrent seizures were randomly assigned into three groups: the stem cell treatment (SCT) group received hUCB-MSCs transplantation into the right hippocampus, the sham control (ShC) group received same procedure with saline, and the positive control (PC) group consisted of treatment-negative epileptic rats. Normal rats received hUCB-MSCs transplantation acted as the negative control (NC). FDG-PET was performed at pre-treatment baseline and 1- and 8-week posttreatment. Hippocampal volume was evaluated and histological examination was done. In the SCT group, bilateral hippocampi at 8-week after transplantation showed significantly higher glucose metabolism (0.990 +/- 0.032) than the ShC (0.873 +/- 0.087; P < 0.001) and PC groups (0.858 +/- 0.093; P < 0.001). Histological examination resulted that the transplanted hUCB-MSCs survived in the ipsilateral hippocampus and migrated to the contralateral hippocampus but did not differentiate. In spite of successful engraftment, seizure frequency among the groups was not significantly different. Transplanted hUCB-MSCs can engraft and migrate, thereby partially restoring bilateral hippocampal glucose metabolism. The results suggest encouraging effect of hUCB-MSCs on restoring epileptic networks.


Subject(s)
Animals , Chronic Disease , Cord Blood Stem Cell Transplantation/methods , Epilepsy, Temporal Lobe/metabolism , Fluorodeoxyglucose F18/pharmacokinetics , Hippocampus/metabolism , Male , Mesenchymal Stem Cell Transplantation/methods , Radiopharmaceuticals/pharmacokinetics , Rats , Rats, Sprague-Dawley , Reproducibility of Results , Sensitivity and Specificity , Tissue Distribution , Treatment Outcome
10.
Article in English | WPRIM | ID: wpr-112420

ABSTRACT

Atrial fibrillation (AF) is a relatively common cardiac arrhythmia that can have adverse consequences due to a reduction in cardiac output and thrombus formation. For patients hemodynamically unstable due to AF, we recommend urgent direct current (DC) cardioversion. The importance of an automated external defibrillator (AED) in the emergency medical field for this purpose is very high. In addition, the distribution rate of an AED in public health care is on the rise. We herein describe a patient whose chronic AF was converted to a sinus rhythm by defibrillation during an episode of sudden cardiac arrest (SCA) which consequently improved left ventricular systolic function. We have experienced the importance of active use of AED.


Subject(s)
Arrhythmias, Cardiac , Atrial Fibrillation , Cardiac Output , Death, Sudden, Cardiac , Defibrillators , Electric Countershock , Emergencies , Heart Arrest , Humans , Public Health , Thrombosis
11.
Radiation Oncology Journal ; : 173-181, 2012.
Article in English | WPRIM | ID: wpr-58448

ABSTRACT

PURPOSE: To evaluate the prognostic value of preoperative neck lymph node (LN) assessment with 18F-fluorodeoxyglucose positron emission tomography (18F-FDG PET), computed tomography (CT), and magnetic resonance imaging (MRI) in oral cavity squamous cell carcinoma (OSCC) patients with pathologically positive LN. MATERIALS AND METHODS: In total, 47 OSCC patients with pathologically positive LN were retrospectively reviewed with preoperative 18F-FDG PET and CT/MRI. All patients underwent surgical resection, neck dissection and postoperative adjuvant radiotherapy and/or chemotherapy between March 2002 and October 2010. Histologic correlation was performed for findings of 18F-FDG PET and CT/MRI. RESULTS: Thirty-six (76.6%) of 47 cases were correctly diagnosed with neck LN metastasis by 18F-FDG PET and 32 (68.1%) of 47 cases were correctly diagnosed by CT/MRI. Follow-up ranged from 20 to 114 months (median, 56 months). Clinically negative nodal status evaluated by 18F-FDG PET or CT/MRI revealed a trend toward better clinical outcomes in terms of overall survival, disease-free survival, local recurrence-free survival, regional nodal recurrence-free survival, and distant metastasis-free survival rates even though the trends were not statistically significant. However, there was no impact of neck node standardized uptake value (SUVmax) on clinical outcomes. Notably, SUVmax showed significant correlation with tumor size in LN (p < 0.01, R2 = 0.62). PET and CT/MRI status of LN also had significant correlation with the size of intranodal tumor deposit (p < 0.05, R2 = 0.37 and p < 0.01, R2 = 0.48, respectively). CONCLUSION: 18F-FDG PET and CT/MRI at the neck LNs might improve risk stratification in OSCC patients with pathologically positive neck LN in this study, even without significant prognostic value of SUVmax.


Subject(s)
Carcinoma, Squamous Cell , Disease-Free Survival , Electrons , Fluorodeoxyglucose F18 , Follow-Up Studies , Humans , Lymph Nodes , Magnetic Resonance Imaging , Magnetic Resonance Spectroscopy , Magnetics , Magnets , Mouth , Neck , Neck Dissection , Neoplasm Metastasis , Positron-Emission Tomography , Radiotherapy, Adjuvant , Retrospective Studies , Survival Rate , Tomography, X-Ray Computed
12.
Journal of Rhinology ; : 60-62, 2012.
Article in Korean | WPRIM | ID: wpr-162776

ABSTRACT

Postoperative maxillary cyst is a rare complication of surgical intervention associated with maxillary sinuses. The present paper describes a 25-year-old man presenting with a lump sensation in the left cheek area after Le Fort I osteotomy and mandibular sagittal split osteotomy. The orthopantomograph revealed a bony defect in the left maxillary alveolus. On the computerized tomography, a 1x2x3cm sized, lower density mass, between the left paramedian side of the maxillary alveolar process and hard palate was observed. The cyst was drained and enucleated. More frequent post-operative maxillary cysts may occur with an increase of Le Fort I osteotomies.


Subject(s)
Adult , Alveolar Process , Cheek , Humans , Maxillary Diseases , Maxillary Sinus , Nonodontogenic Cysts , Orthognathic Surgery , Osteotomy , Palate, Hard , Paranasal Sinus Diseases , Sensation , Surgery, Oral
13.
Article in English | WPRIM | ID: wpr-207211

ABSTRACT

PURPOSE: To compare the abilities of radionuclide salivagrams (RS) and videofluoroscopic swallow studies (VFSS) to diagnose aspiration in children with aspiration pneumonia. METHODS: The records of children who were referred to the Asan Medical Center between April, 2006 and April, 2012 and who underwent both VFSS and RS to evaluate their recurrent aspiration pneumonia were reviewed (n=67). The aspiration positivity rates of the two tests were determined. The agreement between the tests was assessed by using the kappa statistic. RESULTS: VFSS was more frequently positive (n=26, 39%) than RS (n=23, 34%) (p=0.68). In the 11 children who repeat two test, Repeated examination increased positive rate in each tests (n=11), repeated RS (54%, p=1) is more frequent positive than repeated VFSS (46%, p=0.37). If a cumulative positive test had been defined as at least one positive result, the positive rate of two test was 56% (p<0.05). There was a fair agreement between RS and VFSS (kappa=0.26). CONCLUSION: The RS and VFSS positivity rates in children with aspiration pneumonia were similar but there was fair agreement between the two tests. This result suggests that these investigations to demonstrate aspiration are not interchangeable but complementary.


Subject(s)
Child , Humans , Pneumonia , Pneumonia, Aspiration
14.
Laboratory Animal Research ; : 197-201, 2010.
Article in Korean | WPRIM | ID: wpr-108459

ABSTRACT

Spermatogenesis is a particularly difficult process to study the unique multiple cellular associations within the seminiferous epithelium. Laser capture microdissection (LCM) is a recently developed technique that enables the isolation of individual cell populations from complex tissues. The superoxide dismutase (SOD) is the first and most important enzyme of antioxidant defense systems against superoxide anion. The aim of this study was to investigate the quantitative changes of SOD gene expression according to the spermatogenic cycle in mouse testes using LCM and real-time polymerase chain reaction (PCR) techniques. Frozen sections (10 micrometer) were obtained from the testes of 8-weeks-old ICR mice. LCM was used to capture all cells in cross-sectioned seminiferous tubules which were grouped into stages I-V, VII-VIII, and IX-XI. The expression level of cytoplasmic Cu, Zn-SOD (SOD1) mRNA was remarkably higher than those of mitochondrial Mn-SOD (SOD2) and extracellular Cu, Zn-SOD (SOD3) mRNAs in mouse testes. During spermatogenesis, the expressions of SOD1 and SOD2 mRNAs were highest on stages I-V, began to decrease after stage VII, and showed a lowest level on stage IX-XI. However, the expression of SOD3 mRNA was highest on stages VII-VIII. These findings suggest that the subtypes of SOD are expressed differentially in mouse testes during spermatogenesis.


Subject(s)
Animals , Cytoplasm , Frozen Sections , Gene Expression , Laser Capture Microdissection , Mice , Mice, Inbred ICR , Real-Time Polymerase Chain Reaction , RNA, Messenger , Seminiferous Epithelium , Seminiferous Tubules , Spermatogenesis , Superoxide Dismutase , Superoxides , Testis
15.
Article in Korean | WPRIM | ID: wpr-214183

ABSTRACT

Duodenal diverticulitis is difficult to diagnose because it can mimic other common diseases such as cholecystitis and perforated ulcer. Recently, we experienced a rare case of duodenal diverticulitis that was initially suspected on abdominal computed tomography as focal pancreatitis. Although duodenal diverticulitis has been increasingly recognizable before surgery, with the advent of multi-detector computed tomography, misdiagnosis remains problematic since duodenal diverticulitis is commonly not considered in the differential diagnosis of acute abdominal pain. We have to consider this rare disease entity because delayed diagnosis might be a cause of substantial morbidity and mortality.


Subject(s)
Abdominal Pain , Cholecystitis , Delayed Diagnosis , Diagnosis, Differential , Diagnostic Errors , Diverticulitis , Diverticulum , Duodenum , Hydrazines , Pancreatitis , Rare Diseases , Ulcer
16.
Article in Korean | WPRIM | ID: wpr-155608

ABSTRACT

Brown tumor is the benign bone lesion consists of woven bone and fibrous tissue without matrix, which develop due to chronic excessive osteoclastic activity such as hyperparathyroidism. Usually they appear with normal uptake or occasionally focally increased uptake on bone scan. We present a case with brown tumor shown more increased uptake and more number of lesions on bone scan after parathyroidectomy, and lesser increased uptake on serial bone scans without any other treatment through several months. This finding is thought to be similar to 'flare phenomenon' which is occasionally seen after treatment of metastatic bone lesions of malignant cancer, and may represent curative process of brown tumor with rapid normal bone formation.


Subject(s)
Hyperparathyroidism , Osteoclasts , Osteogenesis , Parathyroidectomy
17.
Article in Korean | WPRIM | ID: wpr-139687

ABSTRACT

Neurodegenerative diseases are highly morbid and widespread in the nation with aged population. Since these are progressive and irreversible diseases, early detection and differentiation of the disease are important for possible therapeutic intervention. Alzheimer's disease and Parkinson's disease are the most frequent and costly devastating neurodegenerative diseases. Recent advances of molecular imaging, especially positron emission tomography (PET) technique, allows non-invasive evaluation of not only regional cerebral metabolism or perfusion, but also the change of neurotransmission and presence of abnormal protein such as beta amyloid. In Parkinsonism, dopamine transporter and vesicular monoamine transporter imaging are useful in the diagnosis and evaluation of the disease progression since these provide information about the integrity of presynaptic striatal dopaminergic neurons. In Alzheimer s disease, beta-amyloid imaging can assess the amyloid deposition. It improves early diagnosis and possibility of a presymptomatic diagnostic biomarker; improves understanding of the natural history of amyloid deposition; and has the capability to directly measure the effects of newly developed anti-amyloid therapies. Cholinergic and microglial imaging can be also useful in the early diagnosis of dementia and improves understanding of insights into pathophysiology of neurodegenerative diseases. Therefore, the ability of molecular imaging to identify and quantify cerebral pathology has significant implications for early detection, differential diagnosis, and therapeutic monitoring in neurodegenerative diseases.


Subject(s)
Aged , Alzheimer Disease , Amyloid , Dementia , Diagnosis, Differential , Disease Progression , Dopamine Plasma Membrane Transport Proteins , Dopaminergic Neurons , Early Diagnosis , Humans , Molecular Imaging , Natural History , Neurodegenerative Diseases , Parkinson Disease , Parkinsonian Disorders , Perfusion , Plaque, Amyloid , Positron-Emission Tomography , Radiopharmaceuticals , Synaptic Transmission , Vesicular Monoamine Transport Proteins
18.
Article in Korean | WPRIM | ID: wpr-139686

ABSTRACT

Neurodegenerative diseases are highly morbid and widespread in the nation with aged population. Since these are progressive and irreversible diseases, early detection and differentiation of the disease are important for possible therapeutic intervention. Alzheimer's disease and Parkinson's disease are the most frequent and costly devastating neurodegenerative diseases. Recent advances of molecular imaging, especially positron emission tomography (PET) technique, allows non-invasive evaluation of not only regional cerebral metabolism or perfusion, but also the change of neurotransmission and presence of abnormal protein such as beta amyloid. In Parkinsonism, dopamine transporter and vesicular monoamine transporter imaging are useful in the diagnosis and evaluation of the disease progression since these provide information about the integrity of presynaptic striatal dopaminergic neurons. In Alzheimer s disease, beta-amyloid imaging can assess the amyloid deposition. It improves early diagnosis and possibility of a presymptomatic diagnostic biomarker; improves understanding of the natural history of amyloid deposition; and has the capability to directly measure the effects of newly developed anti-amyloid therapies. Cholinergic and microglial imaging can be also useful in the early diagnosis of dementia and improves understanding of insights into pathophysiology of neurodegenerative diseases. Therefore, the ability of molecular imaging to identify and quantify cerebral pathology has significant implications for early detection, differential diagnosis, and therapeutic monitoring in neurodegenerative diseases.


Subject(s)
Aged , Alzheimer Disease , Amyloid , Dementia , Diagnosis, Differential , Disease Progression , Dopamine Plasma Membrane Transport Proteins , Dopaminergic Neurons , Early Diagnosis , Humans , Molecular Imaging , Natural History , Neurodegenerative Diseases , Parkinson Disease , Parkinsonian Disorders , Perfusion , Plaque, Amyloid , Positron-Emission Tomography , Radiopharmaceuticals , Synaptic Transmission , Vesicular Monoamine Transport Proteins
19.
Article in Korean | WPRIM | ID: wpr-190760

ABSTRACT

PURPOSE: The aim of this study was to determine the incidence and malignant rate of incidental asymmetric palatine tonsillar uptake (ATU) on (18)F-FDG PET/CT in various clinical indications and to evaluate the clinical and PET/CT findings suggesting malignancy. MATERIALS AND METHODS: We retrospectively reviewed a total of 2,901 patients (58.4+/-12.3 yrs, range 20~88 yrs, M:F=1,841:1,060) who underwent (18)F-FDG PET/CT during an 1-year period with various indications except primary tonsillar cancer and lymphoma evaluation. On (18)F-FDG PET/CT, metabolic abnormality of the palatine tonsil and cervical lymph node were visually assessed. ATU was defined as increased palatine tonsillar uptake with diffuse, focal, or irregular pattern compared to contralateral side. The incidence and malignant ratio of ATU were evaluated according to clinical and PET/CT findings. RESULTS: Of 2,901 cases, 290 (10.0%) showed ATU. The incidence of ATU showed seasonal variation and was high in the winter (12.1%). Of 209 cases with ATU confirmed pathologically and/or clinically, five (2.4%) were malignant lesions. ATU with irregular uptake pattern (2/2) and in cases referred for cervical lymph node metastasis of unknown origin (3/5) were frequently associated with malignant lesion (p<0.05). CONCLUSION: ATU was not infrequently observed on (18)F-FDG PET/CT, and the malignant risk of ATU was low. However, ATU with cervical lymph node metastasis or with irregular pattern on PET/CT would be further evaluated by the histopathologic examination.


Subject(s)
Humans , Incidence , Lymph Nodes , Lymphoma , Neoplasm Metastasis , Palatine Tonsil , Retrospective Studies , Seasons , Tonsillar Neoplasms
20.
Article in Korean | WPRIM | ID: wpr-70316

ABSTRACT

Motor neuron disease (MND) and frontotemporal dementia often appear together. We report on a 74-year-old woman who presented with a 18-month history of memory deterioration and MND. Her initial clinical diagnosis was probable Alzheimer's disease (AD) coexisting with MND. We conducted 11C-labeled Pittsburgh Compound-B positron-emission tomography (11C-PIB PET) to discriminate AD from other degenerative dementia, the results from which were negative for amyloid deposition.


Subject(s)
Aged , Alzheimer Disease , Amyloid , Dementia , Female , Frontotemporal Dementia , Humans , Memory , Motor Neuron Disease , Motor Neurons , Positron-Emission Tomography
SELECTION OF CITATIONS
SEARCH DETAIL