Computed tomographic findings in fifteen cases of anterior mediastinal teratoma are presented and comparedwith radiographic , pathologic findings. Specific CT characteristics of anterior mediastinal teratoma arepredominantly fatty mass with a denser dependent element and globular calcification in a solid protuberance intothe cystic cavity. Six cases presented above described characteristic CT findings. Four cases presented waterdensity mass with surrounding thick wall. Fat and calcific densities were present in nine and seven respectively,so these findings are frequently absent. Thick wall was present in all cases. So thick walled cyst even in theabsence of fatty or calcific densities is highly suggestive of anterior mediastinal teratoma.
Teratoma

No abstract available.
Magnetic Resonance Imaging* ; Tuberculosis, Spinal*

No abstract available.
Fibronectins* ; Granulation Tissue* ; Wound Healing* ; Wounds and Injuries*

PURPOSE: Algorithms to get cross-sectional bone density pattern(transverse histogram) to predict the loosening of hip prosthesis using DXA(Dual X-ray Absorptiometry) have been developed. We performed this study to analyze the correlation between radiologic findings and densitometric pattern of the THRA(Total Hip Replacement Arthroplasty) patients. MATERIALS AND METHODS: Thirty-six hips of 32 THRA patients were evaluated. The duration between THRA and DXA was from 1 year 7 months to 15 years. On transverse histogram, the periprosthetic bone density patterns were classified as 3 types;type I, rigid fixation in 17, type II, definite loosening in 8, and type III, partial loosening in 11 cases. Surgical findings, plain X-ray findnings and transverse histogram using DXA were correlated. RESULTS: Among 14 cases performing revision for acetabular prosthesis loosening, 5 cases revealed loosening of fernoral stems while 9 cases revealed rigid fixation of femoral stems. Sensitivity was 100% for either plain X-ray or DXA. Specificity was 88%, 77% for plain X-ray and DXA respectively. CONCLUSION: This preliminary study reveals that periprosthetic bone density pattern on transverse histogram on DXA may be useful in the evaluation of the loosening. However, further study will be needed for clinical application.
Acetabulum ; Arthroplasty, Replacement, Hip* ; Bone Density ; Hip ; Hip Prosthesis ; Humans ; Prosthesis Failure ; Sensitivity and Specificity

PURPOSE: To assess the role of blood vessels in the formation of peritumoral abnormal signal intensity which exaggerates the size of malignant tumor on MR images. MATERIALS AND METHODS: We performed MR-microangiographic-pathologic correlation using implanted VX-2 carcinoma in 16 rabbit thighs 1-28 days after tumor implantation. The shape and distribution of abnormal vessels were analyzed on microangiography and on histologic examination in correlation with peritumoral abnormal signal intensity on MR images. RESULTS: Dilated peritumoral blood vessels gave rise to irregular, tortuous tumor vessels penetrated into the tumor. With the tumor growth, hypervascular tumor vessels in peritumoral area and central avascular areas were increased. These hypervascular areas on microangiography were corresponded with abnormal signal intensity on MR images. CONCLUSION: Hypervascularity could be a cause of peritumoral abnormal signal intensity which exaggerates the size of experimentally induced malignant musculoskeletal tumors on MR images.
Blood Vessels* ; Thigh

We retrospectively analysed plain radiographs and MR imaging of 16 conventional osteosarcoma cases(8 children, 8 adults) which underwent amputations or limb salvage operations. Pathologic correlation was performed with gross and microscopic sections to evaluate 1) whether the open epiphyseal plate can function as a barrier against transphyseal spread of osteosarcoma and 2) the diagnostic value of MR imaging for the detection of the detection of the epiphyseal involvement of osteosarcoma. In children with open epiphyseal plates, conventional radiographs suggested transphyseal tumor growth in one of eight cases(12.5% and MR imaging in seven cases(87.5%). Pathologic examination confirmed epiphyseal involvement in six of seven cases noted with MR imaging(75%). On the the other hand, in adult patients with closed epiphyseal plates, conventional radiographs showed transphyseal tumor growth in six of eight cases(75%), while MR imaging and pathologic exam demonstrated tumor invasion in all cases(100%). We conclude that open epiphyseal plate does not function as and effective barrier against tumor extension, and MR imaging is an excellent method in detecting the extent of transphyseal tumor growth.
Adult ; Amputation ; Child ; Growth Plate ; Hand ; Humans ; Limb Salvage ; Magnetic Resonance Imaging* ; Methods ; Osteosarcoma* ; Retrospective Studies

Total 11 cases of tricuspid atresia were diagnosed radiographically at Seoul National University Hospital in recent two years since 1979. Some characteristic radiological findings were analyzed in chest P-A view and cineangiographies of right atrium and left ventricle. The results are as follows; 1. Among the 11 cases, 4 cases were male and 7 cases were female. Age distribution was from 2 months to 19 years and mean age was 3 1/2 years. 2. Anatomaic types of those cases according to Keith's classification were as follows; type Ia in 2 cases, type Ib in7 cases, type Ic 1 case and type IIb in 1 case. 3. The cineangiographic features of tricuspid atresia are sequential filling of contrast media in the order of right atrium, left atrium, and left ventricle, and triangular filling defect at the base of the heart in all cases, and right atrial dimple in two cases. 4. It is essential for the diagnosis of tricuspid atresia to undertake cineangiographies of right atrium and left ventricle, and the interrelationship of great arteries.
Age Distribution ; Arteries ; Cineangiography ; Classification ; Contrast Media ; Diagnosis ; Female ; Heart ; Heart Atria ; Heart Ventricles ; Humans ; Male ; Seoul ; Thorax ; Tricuspid Atresia

35 neurogenic tumors of the thorax were analyzed with plain film and CT scan. Radiological analysis emphasizedshape, location calcification, bone change, pleural change in plain film and calcification, cystic change, bonechange, pleural change, presence of contrast enhancement in CT scan. The results were as follows; 1. Age may bethe most important clinical factor for differential diagnosis. 2. Plain film findings(35 cases); 1) The mostcommon shape in the ganglion series tumor (ganglioneuroma, ganglioneuroblastoma, neuroblastoma), was elongation(80%) and these tumors generally had tapered borders(50%). In contrast with those of the genglion series, nervesheath tumors(schwannoma, neurofibroma, malignant Schwannoma) showed a definite tendency to be roudn (95%) and thesulcus effect was more frequetnly seen(67.5%). Most of the masses were smooth. The lobulated masses were commonlymalignant ganglion series tumors. 2) Though overall incidence of calcification was low(8.6%), it was observed morefrequently in ganglion series tumors(20%). 3) Associated bony abnormality were generally observed in large tumorsabove 5cm in long axis, especially in neuroblastoma and ganglioneuroblastoma. 4) Tumors showed pleural effusionwere all malignant. 3. CT findings (17 cases); 1) The overall incidence of cystic change of the mass was 23.6%. Itwas most common in Schwannoma(60%). 2) The contrast enhancement was noted in 64.7%. It's degree was variable andshowed no predilection to any specific tumors. 3) The incidence of calcification, associated bony abnormality andpleural effusion were similiar to plain film. Confident specific diagnosis can be made in most of the neurogenictumors of the thorax by shape of the mass in plain film and internal architecture in CT combined with patient'sage as clinical information.
Diagnosis ; Diagnosis, Differential ; Ganglion Cysts ; Ganglioneuroblastoma ; Incidence ; Neuroblastoma ; Neurofibroma ; Thorax ; Tomography, X-Ray Computed

Percutaneous extraction of residual biliary tract stones through T-tube tract was established as a successfuland generally accepted radiologic procedure in patients with post-operative retained stoens. Percutaneous removalof residual stones was performed in 43 patients at the Departement of Radiology, Seoul National UniversityHospital from November, 1982 to August, 1984. The results were as follows; 1. Location of residual stones areintrahepatic in 29 cases(67.4%) extrahepatic in 11 cases (25.6%) and combined in 3 cases. 2. Number of residualbiliary stones was single in 14 cases and 2 to 10 stones in 17 cases. 12 patients had more than 10 stones. 3.Success rate was 100% in extrahepatic stones ans 68.9% in intrahepatic stones. Overall success rate was 76.7% 4.There was no significant complication of this method.
Biliary Tract ; Humans ; Methods ; Seoul

A case of a 39-year-old woman with corrected transposition of the great vessels without significant intracardiac anomaly or coronary disease is reported. The clinical diagnosis of coronary arterial disese was supported in this patient by electrocardiographic changes of probable old anteroseptal myocardial infarction. Coronary arteriographic study showed the morphologic left coronary artery supplied the right-sided ventricle, and the right coronary artery supplied the left-sided ventricle, and the right coronary artery supplied the left-sided ventricle. Although the condition is theoretically compatible with a normal life span, few patient with this lesion survive past 40 years of age because of the subsequent heart block or functioning as a systemic ventricle.
Adult* ; Anterior Wall Myocardial Infarction ; Coronary Angiography* ; Coronary Disease ; Coronary Vessels ; Diagnosis ; Electrocardiography ; Female ; Heart Block ; Humans