[Collection in the thigh revealing bladder fistula after radiotherapy for prostate cancer].

Urinary fistulas are a rare late complication after radiotherapy for prostate cancer. We here report the case of a 76-year old patient who had undergone radical prostatectomy 4 years before followed by external beam radiotherapy for prostate cancer. The patient presented with recurrent thigh swelling . Clinical examination showed renitent and painless mass at the level of the medial compartment of the right thigh. Ultrasound followed by CT scan showed big homogeneous fluid collection in the inner thigh exercising a slight compression on femoral vessels. Surgical drainage was performed removing 900 ml cloudy liquid whose bacteriological examination was negative. Post operative suites were marked by a sharp reduction of diuresis. However significant quantity of clear liquid continued to be drained. Given the patient's clinical picture, methylene blue test followed by retrograde cystography were performed confirming the diagnosis of fistula originating from the ureterovesical junction. The drainage of the collection was obtained through the insertion of a local probe for several weeks.