PURPOSE: To describe soft-tissue radiographic and high-resolution CT findings of radiation-induced lung injury of rabbit over time and to correlate them with pathologic findings. MATERIALS AND METHODS: 15 rabbits were irradiated in the right lung with one fraction of 2000 cGy. After 4, 6, 12, 20, 24 weeks, 3 rabbits in each group were sacrificed and soft-tissue radiographs and high-resolution CT of their lung tissue were obtained. Radiological findings were correlated with pathologic findings. RESULTS: On soft- tissue radiogram, radiation pneumonitis shown as consolidation with air-bronchogram occurred in 3 cases after 6 weeks, and in 1 case after 12 weeks of irradiation. In addition, pneumonic consolidation with adjacent pleural contraction was seen in 2 cases after 12 weeks of irradiation. Fibrotic changes indicated by decreased volume occurred after 20 weeks and combined bronchiectatic change and bronchial wall thickening appeared after 20 weeks(N=1), and 24 weeks(N=3). HRCT findings of radiation pneumonitis were homogeneous, increased attenuation after 4 weeks(N=3), 6 and 12 weeks (each N=I), patchy consolidation after 6 and 12 weeks(each N=2), discrete consolidation after 12, 20 and 24 weeks(each N=I) and solid consolidation after 20 and 24 weeks(each N=2). Pathologically radiation pneumonitis and pulmonary congestion were seen after 4 and 6 weeks. After 6 weeks, collagen and reticulin fibers were detected along alveolar wall. Mixed radiation pneumonitis and fibrosis were detected after 12 weeks. 20 weeks after irradiation, fibrosis was well defined in interstitium and in 24 weeks, decreased number of alveoli and thickening of bronchial wall were defined. CONCLUSION: Radiation pneumonitis was provoked 4 weeks after irradiation on rabbit lung and progressed into radiation fibrosis 20 weeks after irradiation on soft-tissue radiographs and high-resolution CT. High-resolution CT is more precise in detecting early radiation pneumonitis and detailed pathologic findings.
Collagen ; Estrogens, Conjugated (USP) ; Fibrosis ; Lung Injury ; Lung* ; Rabbits ; Radiation Pneumonitis ; Reticulin

BACKGROUND: Syncope is both one of the most common and one of the most challenging problems seen in medical practice. In spite of intensive medical evaluation, the cause of syncope remains unknown in a significant number of patients. In recent years, head-up tilt test has been of increasing interest as a diagnostic aids in patients with unexplained syncope. This study investigated the clinical utility of this technique in te evaluation of patients with vasovagal syncope. METHODS: Seven patients with unexplained syncope were evaluated with a 60 degree or 80 degree head-up tilt test with or without intravenous infusion of isoproterenol(1-4ug/min) in an attempt to provoke bradycardia, hypotension or both. There were 4 males and 3 females with a mean age of 35+/-8 years. RESULTS: 1) During head-up tilt test, vasovagal responses were provoked in 5 of 7 patients(71.4%) with syncope of unknown origin. During the test, there was no complication associated with the test. 2) During tilt-induced vasovagal reponse, mean systolic blood pressure decreased to 84+/-12mmHg from supine control of 125+/-21mmHg(p<0.01) and mean diastolic blood pressure decreased to 50+/-17mmHG from supine control of 76+/-14mmHg(p<0.01). 3) Five patients with positive results of the tests were followed up for 12months and they had a good outcome free of recurrence. CONCLUSION: Head-up tilt test appeared safely applicable test in patients with suspected vasovagal syncope and good prognosis was expected in the patients.
Blood Pressure ; Bradycardia ; Female ; Follow-Up Studies* ; Humans ; Hypotension ; Infusions, Intravenous ; Male ; Prognosis ; Recurrence ; Syncope ; Syncope, Vasovagal*

Femoral head and neck fractures during the course of avascular necrosis are rare with only few reports in the English literature. Moreover, there are very few reports on an analysis of the patterns of these fractures. Four cases of femoral head fracture caused by minor trauma, which were quite different from the crescent fractures during the course of avascular necrosis were analyzed in regard to the underlying disease, causes, sites, types, directions, pattern of fractures and the injury mechanism of the fractures. The results are reported with special regard to the pattern of the stress fracture of the femoral head and neck during the course of avascular necrosis.
Fractures, Stress ; Head* ; Neck* ; Necrosis*

The results of 17 fractures of tibial shaft treated with Rush nails under the image intensifier and early weight bearing are reported. Thirteen of these fractures were closed. All fractures were united between 12 and 21 weeks clinically, 17 and 26 weeks radiologically after operation. All cases were healed without significant complications, such as fracture disease. The advantages of this method were as follows; 1) normal knee motion and early weight bearingare possible during healing. 2) There is a relatively rapid restoration of bone continuity. This method of treatment for tibial shaft fractures were indicated as follows; 1. Mid-shaft fracture. 2. Segmental fracture of shaft. 3. Expectation of compression force at fracture surface by weight bearing. 4. Open fracture of shaft.
Fractures, Open ; Knee ; Methods ; Tibia ; Weight-Bearing

No abstract available.
Temporal Bone*

The purpose of this study is to evaluate the morphologic findings of the labrum and capsuloligamentous structures in the normal and unstable shoulders and to compare the effectiveness of double contrast arthrographic findings which were taken with supine and prone position. We reviewed the computerized tomographic arthrogram in 9 cases of normal shoulder and l3 cases of shoulder instability. We evaluated the shape of the labrum, the attachment of anterior capsule and the amount of capsular laxity. Capsular laxity was compared each others in normal, the unidirectional instability and the multidirectional instability. Among these materials, we simultaneously performed CT arthrogram with supine and prone position and evaluated which is more reliable and accurate. Scapular inclination was ahout 25 degrees in the supine position and ahout 60 degrees in the prone position. Normal glenoid labrum varied in size and shape, so its lack of a classic appearance might not indicate a labral tear. Variations existed in the anterior capsular attachment onto the glenoid. The anterior capsule was used to attach far away from the glenoid rim. but it might not indicate an anterior instability. With the prone position, the labral lesion took more excellent visualization due to the contrast coating on the glenoid labrum in both anterior and posterior. Anterior capsular expansion was seen well with prone position in anterior instability. In summary, for proper interpretation of the instability, awareness of the morphologic variations of the labrum and capsuloligamentous structure is important. CT double contrast arthrography with prone position has made a significant contribution to improving and easing the documentation of variety of anatomic abnormalities. Now we recommend the prone position in CT arthrogram for imaging glenoid labrum pathology in shoulder instability.
Arthrography ; Pathology ; Prone Position ; Shoulder* ; Supine Position

Female ; Follow-Up Studies ; Headache ; Humans ; Incidence ; Neck ; Neck Pain ; Shoulder Pain ; Temporomandibular Joint

Little is known as to why elevated red cell distribution width (RDW) is associated with adverse clinical outcomes in patients with atrial fibrillation (AF). We hypothesized that RDW value might predict the intensity of anticoagulation, resulting in higher adverse events in patients with AF taking warfarin. We analyzed 657 patients with non-valuvular AF who took warfarin. The intensity of anticoagulation was assessed as mean time in the therapeutic range (TTR) and defined TTR ≥60% as an optimal intensity. The primary end-point was the composite of stroke/systemic embolism and major bleeding. The secondary end-point was the composite of stroke/systemic embolism, major bleeding and death. The relationship between the baseline RDW with TTR and clinical outcomes was assessed using categorical variables as quartiles or dichotomous variables. The mean value of TTR decreased as an increment of the RDW (45.2% vs. 44.7% vs. 40.8% vs. 35.2%, p < 0.001). Primary and secondary end-points were significantly increased when TTR was less than 60% and RDW was more than 13.6%. Ratio of patients achieving optimal anticoagulation were significantly decreased as an increment of RDW. A RDW of ≥13.6% was a significant predictor for poor anticoagulation control (adjusted Odds ratio [OR] 0.43, 95% confidence interval [CI] 0.23–0.82), stroke (adjusted hazard ratio [HR] 3.86, 95% CI 1.11–13.40), primary (adjusted HR 1.88, 95% CI 1.12–3.16) and secondary end-point (adjusted HR 2.46, 95% CI 1.26–4.81). RDW was negatively associated with TTR in patients with AF. Therefore, RDW might be a useful marker for the prediction of anticoagulation response and clinical outcomes in patients with AF.
Anticoagulants ; Atrial Fibrillation* ; Embolism ; Erythrocyte Indices* ; Hemorrhage ; Humans ; Odds Ratio ; Prognosis ; Stroke ; Warfarin

Yolk-sac tumor in the testis is a very rare testicular tumor, most of which occurred in young children. Typical microscopic finding of yolk-sac tumor reveals perivascular mantles (Schiller-Duval body) with papillary structure. In the absence of distant metastasis, prognosis of yolk-sac tumor is known to be good. Recently. we experienced a case of yolk-sac tumor of the testis in 19 months male infant who had pulmonary metastasis with poor prognosis.
Child ; Endodermal Sinus Tumor ; Humans ; Infant* ; Male* ; Neoplasm Metastasis* ; Prognosis ; Testis*

PURPOSE: To report variable radiologic manifestastions and to accomplish detailed radiologic-pathologic correlation of solid and papillary epithelial neoplasm of the pancreas. MATERIALS AND METHODS: In 23 patients with surgically confirmed solid and papillary epithelial neoplasm, retrospective examinations of operative records, gross and micropathologic findings, and radiologic findings including US(n=17), CT(n=23), ERCP(n=9), MRI(n=3) were carried out. On the basis of pathologic findings, detailed analysis of radiologic findings of solid and papillary epithelial neoplasm was then performed. RESULTS: Most pancreatic solid and papillary epithelialneoplasms(n=17) were seen as a mass with heterogeneous internal density consisting of cystic change, hemorrhagicnecrosis, and tumor tissue, although the mass can also be seen to be homogeneous(n=6). On gross specimens, acapsule which showed enhancement on the delayed phase of the enhanced CT scan was demonstrated in 22 cases. It was seen as an echogenic rim on the ultrasound images and as a low signal rim on the MR images. Calcification of themass was seen in ten cases, nine of which showed peripheral calcification along the tumor capsule ; five cases showed calcifications within the mass. On pathologic examination, ten cases had a single or multiple cystic appearance ; in seven of these cases, this appeared on CT scan. CONCLUSIONS: In addition to usual mixed internal density caused by hemorrhagic necrosis of the tumor, enhanced capsule and internal multicystic appearance on CT scan were other characteristics of pancreatic solid and papillary epithelial neoplasm. These could be useful findings in the radiologic approach and in the differential diagnosis of pancreatic masses.
Diagnosis, Differential ; Necrosis ; Neoplasms, Glandular and Epithelial* ; Pancreas* ; Retrospective Studies ; Tomography, X-Ray Computed ; Ultrasonography