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Pancreatic Tumors: Emphasis on CT Findings and Pathologic Classification
조희우,최진영,김명진,박미숙,임준석,정용은,김기황 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.6
Pancreatic tumors can be classified by their morphologic features on CT. The subtypes include solid tumors, mixed cystic and solid lesions, unilocular cysts, multilocular cystic lesions, and microcystic lesions. Endoscopic US and MRI can provide detailed information for classifying pancreatic lesions. Each subtype has different kinds of tumors and malignant potential, thus the classification can be useful for a better differential diagnosis and treatment planning. For this purpose, we suggest an appropriate modified classification system by using the imaging features of pancreatic tumors with an emphasis on CT findings and illustrate various findings of typical and atypical manifestations.
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조희우,박진오,이영한,정수윤,서진석 대한자기공명의과학회 2015 Investigative Magnetic Resonance Imaging Vol.19 No.4
Purpose: To determine whether we should recommend ultrasonography (US) foran incidental thyroid nodule identified by additional cervicothoracic sagittal T2-weighted image (C-T sag T2WI) of lumbar spine magnetic resonance imaging (MRI). Materials and Methods: A retrospective study of 61 patients who underwent bothlumbar spine MRI and thyroid US between December 2011 and April 2015 wasconducted. For all US-found thyroid nodules > 1 cm, investigators evaluated whetherthere was any correlation between thyroid nodule detectability by C-T sag T2WI andUS features such as echogenicity, composition, or suspicion of malignancy. Results: Solid hypoechoic (2/4; 50%) or mixed echoic nodules (4/8; 50%) appearedto be found relatively more easily by C-T sag T2WI than more benign-looking solidisoechoic (1/4; 25%) or spongiform nodules (0/6; 0%). Among six nodules withultrasonographic suspicion for malignancy, only one nodule was detected by C-T sagT2WI. Conclusion: If an incidental thyroid nodule is seen by C-T sag T2WI, it would bebetter to recommend thyroid US for identifying malignancy.
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조희우,서진석,박진오,김형식,정수윤,이영한,한석 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.6
Purpose: To evaluate the diagnostic performance of three-dimensional fast spin-echo (3D FSE-Cube) without fat suppression (NFS) for detecting knee lesions, using comparison to 3D FSE-Cube with fat suppression (FS). Materials and Methods: One hundred twenty-four patients who underwent 1.5T knee magnetic resonance imaging (MRI) scans and 25 subsequent arthroscopic surgeries were retrospectively reviewed. Using arthroscopic results and two-dimensional images as reference standards, diagnostic performances of 3D FSE-Cube-NFS and FS imaging about lesions of ligament, meniscus, subchondralbone marrow edema (BME), and cartilage were compared. Scan parameters of 3D FSE-Cube imaging were previously optimized by a porcine knee phantom. Results: No significant differences were observed between detection rates of NFS and FS imaging for detecting lesions of meniscusand cartilage (p>0.05). However, NFS imaging had lower sensitivity for detection of medial collateral ligament (MCL) tears, and lower sensitivity and specificity for detection of BME lesions, compared to FS imaging (p<0.05). Conclusion: 3D FSE-Cube-NFS imaging showed similar diagnostic performance for detecting lesions of meniscus or cartilage compared to FS imaging, unlike MCL or BME lesions.
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염태준,조희우 대한초음파의학회 2012 ULTRASONOGRAPHY Vol.31 No.4
제 1형 다발성 내분비 선종은 특징적인 임상적, 영상의학적 소견을 갖는 유전성 질환이다. 지금까지 이 질환의 임상적, 유전학적 소견에 대한 보고는 많았으나 영상의학적소견에 대한 증례 보고는 없었다. 저자들은 위 십이지장 궤양의 임상 증상을 가진 환자에서 영상의학적 소견을 기반으로 하여 제 1형 다발성 내분비 선종을 진단한 예를 보고한다. Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant inherited syndrome with characteristic clinical and radiological manifestations. Many reports on MEN1 have been published; however, no cases of radiologically diagnosed MEN1have been reported. Therefore, we report on a radiologically diagnosed case of MEN1with clinical symptoms of gastroduodenal ulcer
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최윤성,이영한,김성준,조희우,송호택,서진석 연세대학교의과대학 2013 Yonsei medical journal Vol.54 No.4
Purpose: To validate the feasibility of real time kinematography with four-dimensional (4D) dynamic functional wrist joint imaging using dual source CT. Materials and Methods: Two healthy volunteers performed radioulnar deviation and pronation-supination wrist motions for 10 s and 4 s per cycle in a dual source CT scanner. Scan and reconstruction protocols were set to optimize temporal resolution. Cine images of the reconstructed carpal bone of the moving wrist were recorded. The quality of the images and radiation dosage were evaluated. Results: The 4D cine images obtained during 4 s and 10 s of radioulnar motion showed a smooth stream of movement with good quality and little noise or artifact. Images from the pronation-supination motion showed noise with a masked surface contour. The temporal resolution was optimized at 0.28 s. Conclusion: Using dual source CT, 4D cine images of in vivo kinematics of wrist joint movement were obtained and found to have a shorter scan time, improved temporal resolution and lower radiation dosages compared with those previously reported.
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안찬식,이영한,김성준,조희우,서진석,송호택 대한자기공명의과학회 2013 Investigative Magnetic Resonance Imaging Vol.17 No.1
Purpose : The purpose of this study was to find and categorize the various magnetic resonance imaging (MRI) findings of spinal metastases that correlate with the type of primary cancer. Materials and Methods: We retrospectively reviewed gadolinium-enhanced magnetic resonance images of 30 patients with 169 spinal metastatic lesions from lung cancer (n = 56), breast cancer (n = 29), colorectal cancer (n = 20), hepatocellular carcinoma (HCC) (n = 17), and stomach cancer (n = 47). The size, location, extent of invasion, signal intensity, margin,enhancement pattern, and osteoblastic or osteolytic characteristics of each metastatic tumor were analyzed. Results: The metastatic lesions from HCC were larger than those from the other primary tumors (P < 0.05) except for colorectal cancer (P = 0.268). Well-defined metastatic tumor margins were more frequently seen in lung cancer and breast cancer (P < 0.01). All but HCC showed a tendency to invade the vertebral body rather than the posterior elements (P <0.02). Colorectal cancer and HCC showed a tendency toward extraosseous invasion without statistical significance. HCC showed a characteristic enhancement pattern of ‘worms-in-a-bag’. Rim enhancement with a sclerotic center was only seen in spinal metastases from stomach cancer. Conclusion: Despite many overlapping imaging features, spinal metastases of various primary tumors display some characteristic MRI findings that can help identify the primary cancer.
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