Clinical Presentation

A newborn with in utero hydronephrosis.

Further Work-up

(A,B) Sonographic images demonstrate severe hydronephrosis (arrow) and hydro-ureter (arrowhead). The findings were present bilaterally. (C) Oblique image from a voiding cysto-urethrogram demonstrates a bullet-shaped dilatation of the posterior urethra (arrow) with reflux into the (arrowhead) dilated ureter. The more distal urethra is of normal caliber.

Differential Diagnosis

• Posterior urethral valves: