ABSTRACT
During follow-up of Kock pouch, we found 5 cases of stones in the pouches (3 cases in male and 2 cases in female). Follow-up period was ranged from 34 to 62 months. The size of the stones varied from 0.5 to 4.3cm. 4 cases of stones were managed by endourological procedures, using ultrasonic and electrohydraulic lithotripsy. A case fail to manage by endourological procedure end so needs open operation. No complication occurred during or after the procedure. Spinal anesthesias were necessary in 5 patients. The stones were usually developed around suture materials near efferent nipple valve. The major component of the stones was struvite. We suggest that causes of stone development in Kock pouch may be suture materials and infected residual urine.