Fig. 5. Primary obstructed megaureter.

A. Longitudinal sonogram of the left kidney in a 1-month-old female infant shows significant dilation of the pelvocalyceal system. B. In addition, there is diffuse dilation along the course of the left ureter (arrows). No reflux is identified on voiding cystourethrography (data not shown). C. Magnetic resonance urography confirming significant dilation of the entire length of the left ureter and of the pelvocalyceal system. This patient underwent ureteroneocystostomy and no anatomic narrowing was identified at the ureterovesical junction.