An unusual form of duplicate bladder exstrophy.

Duplicate bladder exstrophy is a rare variant of the exstrophy/epispadic lesions in which an external patch of exstrophic bladder presents in addition to a closed bladder in a more normal anatomical position, diastasis of the pubis and rectus muscles, and often a form of epispadias. We describe an anomaly of this variant with a fistula to the closed bladder. Careful examination with fluoroscopy and cystoscopy is helpful in defining the anatomy in these variants.