[Polyp of the posterior urethra. Apropos of 6 cases].

Polyp of posterior urethra is a rare cause of urinary obstruction. Attached by a pedicle to the superior part of the veru montanum, such a polyp is mobile and can move in the bulbar urethra, causing urinary retention. If can also bleed provoking either hematuria or urethrorrhagia. Urinary infection can be present. Vesico-urethral ultrasound examination can show the polyp. But the diagnosis is made on a voiding cystourethrogram either at the end of an intravenous pyelogram or after suprapubic puncture of the bladder. Cystourethroscopy can also diagnose the lesion, and can treat it by electrocoagulation of the pedicle. Surgery by suprapubic incision and cystostomy is another method of treatment. It is perhaps less dangerous that the endoscopic treatment because the pedicle is very close to the ejaculatory ducts. Pathology of polyp of posterior urethra is variable but benign. The most frequent lesion is a fibrous polyp specially in children. Recurrency of such a lesion is very exceptional.