Cystic renal cancers based on a series of 6 cases.

The authors present six cases of cystic renal cancers which raised preopera tive and intraoperative diagnostic difficulties. Computed tomography is cur rently the most reliable diagnostic examination. The diagnosis of complicat ed benign cyst must be made cautiously and persistence of doubtful images m ust lead to surgical exploration. The authors try to up-date the diagnostic strategy for atypical cysts based on recent progress in medical imaging an d propose a practical approach to treatment.