[Computed tomography and ultrasonography of lymphoma involving urogenital systems]

Fourteen cases of lymphoma involving urogenital systems (10 kidney, 1 bladder and 3 female genital system) were studied as to their image manifestations. In all 10 kidney cases of diffuse non-Hodgkin's lymphomas, multiple parenchymal nodules were found in 4, single mass in 3, perirenal involvement (Halo sign) with multiple nodules in the kidney in 2 and diffuse infiltration in the other one. The main ultrasonographic findings were hypoecho solid lesions without sharp margins. On pre-contrast CT scans, most of the lesions had similar attenuation as the normal renal parenchyma. After contrast, the normal parenchyma was enhanced much more than the lesion. The lesion may be missed if scan was performed without contrast enhancement. In the 3 cases with involvement of the female genital organs, the involved uterus and cervix were obviously enlarged and vaginal wall became thickened as hypoecho in B-ultrasound. Multi-planned scanning ultrasound is very helpful in showing the relation between pelvic mass and uterus.