[Sonography of experimental hypovascularized kidney tumors].

The authors studied the sonographic features of Vx2-renal carcinomas in rabbits induced by the Vargha method. The series consisted of 81 rabbits with Vx2-renal carcinomas, 17 controls, five rabbits with retrorenal Vx2-carcinomas and 56 rabbits with gluteal Vx2-carcinomas. In 70.8% ultrasound showed changes on the tenth day and in 98.6% on the 14th day; usually these were of low echogenicity, in 32.4% there was mixed echogenicity and in a few a highly echogenic pattern was found. After 21 days the ultrasound pattern became increasingly of poor echogenicity. 41.3% showed of necrosis by 14 days and after 21 days 100% were necrotic. On the seventh day Vx2-renal carcinomas were mostly hyper-reflective.