Fig. 2From: Pediatric congenital buttock sinus tract:10-year experience in a single institutionSurgical procedures. The patient was placed in a prone position to expose the dimple (a), and we inserted the ureteral catheter through the dimple to the sinus tract and injected methylene blue (b). Dissection should be close to the tract layer-by-layer (c-d) until the retrorectal space is reachedBack to article page