Anorectal malformation: a new anatomic variant resembling an H-type fistula.

A new anatomic variant of an anorectal malformation resembling an H-type fistula was observed in a newborn girl. This variant consisted of a high-grade stenosis of the anal canal below the level of the levator muscle with a blind-ending fistulous tract originating from the stenotic segment and running toward the posterior wall of the vestibulum. The embryogenesis of this malformation remains to be seen.