Figure 847

Excretory urogram of a patient with posterior urethral valves. Bladder outlet obstruction results in bladder wall thickening, tra-beculation, and formation of diverticula. Increased intravesical pressure may result in vesicoureteral reflux, as is seen on the left. Obstruction resulting in increased intrarenal pressure may result in rupture at the level of a renal fornix, producing a urinoma, or perirenal collection of urine, as seen on the right.

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