Figure 848

Voiding cystourethrogram (VCUG) demonstrating posterior urethral valves and dilation of the posterior urethra. Urethral valves are best detected by VCUG. The obstructing valves are seen as oblique or perpendicular folds with proximal urethral dilation and elongation. Distal to the valves the urinary stream is diminished. Alleviating the bladder outlet obstruction is indicated, either by lysis of the valves themselves or by way of vesicostomy, in small infants until sufficient growth occurs to make valve resection technically feasible.

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