Posterior urethral polyp is a rare disease, predominantly affecting bo
ys, The authors report the case of an 10-month-old boy admitted to hos
pital with acute urine retention. The diagnosis of polyp was establish
ed on cystourethrography, ultrasonography and endoscopy. The polyp was
resected via a bladder incision after failure of transurethral resect
ion. Posterior urethral polyp is a benign tumour whose clinical presen
tation is dominated by signs of lower urinary tract obstruction. Cysto
urethrography and ultrasonography confirm the diagnosis and assess the
repercussions on kidneys and bladder. Endoscopy has a double role: di
agnostic and therapeutic.