Bladder outflow obstruction masquerading as pelviureteric junction (PUJ) obstruction.

We report a case of bladder outflow obstruction presenting with upper tract dilatation mistaken initially as pelviureteric junction (PUJ) obstruction. The lower tract obstruction ought to be dealt with first before upper tract obstruction is assessed because the renal pelvic pressure is significantly affected by vesical filling and high bladder pressure.