[Radiological findings in renal capsular tumors (author's transl)]

Renal capsular tumors are rare. Preoperative diagnostic is based on radiology. Typical urographical findings are marginal impression and dislocation of the entire kidney without deformation of renal pelvis and calices. Angiography is the most decisive method of investigation, especially in malignant mass lesions. These tumors generally have hypovascular neovascularity without puddling. They can be supplied both by capsular and renal, lumbar and intercostal arteries. The renal parenchyma is contrasted homogeneously without defects, the margin is sharply defined. Computer tomography can best demonstrate the extent of the lesion and distinguish it from neighboring organs; in lipomas and cysts even a histological prediction is justified with this method. Preoperative diagnostic accuracy is limited by the fact, that even the pathologist, in some cases, is not able to decide upon the origin of these tumors.