Renal capsular tumors: the angiographic features.

Five masses of the renal capsule, which were studied angiographically, demonstrated a typical inward displacement of the renal parenchyma, and prominence and variable displacement of the renal capsular arteries. Benign lesions typically lacked malignant neovascularity and had a sharp interface with the renal parenchyma. The angiographic characterization of renal capsular lesions may help in identification of benign lesions and prevent unnecessary nephrectomy.