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S Yachiku

Publications and source records attributed to S Yachiku.

198 records · Page 11Linked to original sources
PubMedDate not supplied

CT evaluation of primary benign retroperitoneal tumor.

We studied CT patterns in 21 cases of primary benign retroperitoneal tumor including teratoma in nine cases, schwannoma in six, leiomyoma in three, lipoma in one, lymphangioma in one, and neurofibroma in one. The tumors were analyzed for size, internal homogeneity, CT density, calcification, border with neighboring organs, and contrast enhancement (CE). The mean diameter of the tumors was 10.2 (+/- 4.8) cm. Internal homogeneous distribution was observed in 33%, calcification in 43%, and well-defined border in 86%. The CT density and calcification were compared according to histology, and the results were as follows: teratoma showed fat density in 78%, water density in 100%, and calcification in 89%; schwannoma showed water density in 100% and septal CE in 33%; leiomyoma showed soft tissue density in 100%, CE in 100%, and water density in 33%; lipoma showed fat density and calcification; and lymphangioma and neurofibroma showed water density. Internal homogeneity, fat density, cyst formation, and calcification are considered to be important predictors of primary benign retroperitoneal tumor on CT.

Adolescent↗
PubMedDate not supplied

Evaluation of renal and perirenal leiomyoma on US, CT, and angiography.

The findings of US, CT, and angiography were analyzed in five rare cases of renal and perirenal leiomyoma. The margin of the tumors was shown to be regular by each method, and the tumors were found to be heterogeneous by US and CT. US showed hypoechoic (80%) and mixed echoic (20%) echo patterns. CT revealed soft tissue density with contrast enhancement. Angiography disclosed hypovascularity (25%), and slight vascularity (75%), but no arterial encasement, A-V shunt, or vein invasion. Although no findings specific to the differential diagnosis of malignant tumors were found, benign tumors should be considered when the following signs are detected: (1) a large (more than about 5 cm), well-defined, regular abdominal mass with few symptoms, (2) a heterogenous hypoecho on US, (3) enhanced soft tissue density on CT, and (4) angiography without arterial encasement, A-V shunt, or vein invasion.

Diagnostic Imaging↗