Figure 846

Posterior urethral valves. A, Illustrative diagram. B, Pathology specimen. Valvular obstruction at the posterior urethra is the most common cause of lower urinary tract obstruction in boys. Anatomically, the lesion most commonly is comprised of an oblique diaphragm with a slitlike perforation arising from the posterior urethra distal to the verumontanum and inserting at the midline anterior urethra. (From Kaplan and Scherz [74]; with permission.)

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