True occult bladder perforation during placement of tension-free vaginal tape.

Bladder perforation is one of the most common complications of the trans-vaginal tape (TVT) procedure, and is generally identified on routine intra-operative cystoscopy. We present a case of occult bladder perforation occurring during the TVT procedure that could not be identified by cystoscopy. A 57-year-old woman underwent TVT placement for treatment of stress urinary incontinence. A bladder perforation, suspected because of clear fluid at one of the abdominal incision sites, could not be identified with cystoscopy, but was confirmed with bladder installation of sterile infant formula. The tape was removed and the bladder was drained for 48 h. The patient's recovery was uneventful and she subsequently underwent TVT placement without complication. Cystoscopy alone may be inadequate for identification of some bladder perforations during the TVT procedure. Awareness of alternative methods of identification is essential.