[Computed tomography of renal angiomyolipomas]

22 cases of angiomyolipoma were studied by computerized tomography. Characteristics of the tumours were density values less than -25 HU in 21 patients; one patient having tuberous sclerosis showed higher attenuation values. In 6 of 22 patients angiomyolipomas were associated with tuberous sclerosis. Two large tumours presented with spontaneous rupture and massive retroperitoneal hemorrhage. CT findings are sufficiently typical for angiomyolipomas and therefore suitable for distinguishing the benign lesion from renal cell carcinoma.