Pediatric Radiology > Genitorinary > Hydronephrosis > Primary Megaureter

Primary Megaureter

Primary megaureter is demonstrated by a straightened dilated ureter which is not tortuous. Primary megaureter is secondary to a short aperistaltic distal segment of the ureter, resulting in a functional obstruction. The degree of obstruction can be quantified with a nuclear medicine scan or an intravenous urogram. Primary megaureter is more common on the left but can be bilateral.
Scintigraphy	Enlarged right ureter
US of hydronephrosis caused by a megaureter	Left megaureter