[Diagnostic and therapeutic problems of an atypical cyst of the kidney]

Atypical renal cyst raises diagnostic and therapeutic problems. The authors report a case of atypical renal cyst which raised numerous diagnostic and therapeutic problems. The authors discuss theses problems in the light of this case. A farmer consulted for right lumbar pain without hematuria and hydaturia. Hydatic serology was negative. Ultrasonography and CT scan showed atypical cyst in favour of hydatic cyst. Surgical investigations showed a necrotico-hemorragic cyst, and cystectomy was performed. Histological examination revealed a chronic inflammatory process without malignancy. One year after the operation, clinical and radiological examination were normal.