[Problems in diagnosis and therapy of renal adenomas (author's transl)]

Diagnostic and surgical problems of renal adenoma are discussed on the basis of seven own cases and the literature. The surgical procedure should be based on exact histomorphological classification of the tumors, which can be classified as: "Benign adenoma", "adenoma with questionable malignancy", and "Malignant degenerated adenoma". The often recommended radical surgery in all cases of renal adenomas should not be necessary. Histological diagnosis is most accurate with serial sections of embedded tumor material. False positive results from intraoperative histomorphologic diagnosis of frozen sections are not here. The difficult preoperative diagnosis of renal adenomas could be improved by computed tomography and ultrasonography.