Anterior urethral valves in the fossa navicularis in children.

Anterior urethral valves are an uncommon cause of lower urinary tract obstruction in children. They have been noted in the bulbous (40 per cent) and penile (30 per cent) urethra, and at the penoscrotal junction (30 per cent). None has been reported in the fossa navicularis. We encountered 3 cases in which anterior valves were located in the glanular urethra. This entity may be misdiagnosed as meatal stenosis and without a high index of suspicion it might be overlooked. The combination of distal obstruction and a normal urethral meatus should lead one to suspect this entity. Observation of the voided stream is extremely helpful in the diagnosis, since voiding urethrography often fails to include the penile tip and urethroscopy of the distal urethra often is unsatisfactory. Treatment can be performed either transurethrally or by excision through the meatus.