MRI findings in a rare cause of bladder outlet obstruction.

CASE REPORT. A 30 year old woman presented with acute urinary retention. She had a 3 month history of increasing difficulty passing urine. There was no history of haematuria or dysuria. An intravenous urogram revealed a large mass causing elevation of the bladder base on the right side. There was no significant ureteric obstruction, though the right ureter was slightly full (fig. 1). Ultrasound examination showed a hypoechoic slightly inhomogenous mass measuring 6 cm by 5 cm (fig. 2). It was unclear whether this arose from within or from below the bladder. The uterus was slightly bulky but not in continuity with the mass. Cystoscopy suggested extrinsic compression and