Problems of assessment in the surgery of renal adenomas.

We report 6 cases of renal adenomas in which difficulties were encountered in the determination of malignancy. The clinical and anatomical data are discussed, particularly the difficulties with the histological frozen section diagnosis of such tumors, together with the therapeutic outcome. The objective of a differentiating procedure is to increase the number of operations with organ conservation, while avoiding metastasis that could be derived from apparently benign renal adenomas.