[Cystic renal cancers. Review of 6 cases]

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