[A case of retention cyst in the prostate complicated of dysuria: a case report].

A 42-year-old man presented with the chief complaint of dysuria which occurred suddenly. He showed a large quantity of post-voiding residue. Abdominal ultrasonography and cystoscope revealed a hypo-echoic mass with a diameter of 15 mm at the bladder neck. Transurethral resection of the cyst was performed, and dysuria was markedly improved. Pathological examination showed a retention cyst of the prostate.