exstrophy

(medicine) Eversion; the turning inside out of a part.

A congenital turning out or eversion of a hollow organ.

The turning inside out of an organ.

• bladder e. — congenital absence of a portion of the abdominal wall and bladder wall, the bladder appearing to be turned inside out, with the internal surface of the posterior wall showing through the opening in the anterior wall.
• cloaca e. — a developmental anomaly in which two segments of bladder (hemibladders) are separated by an area of intestine with a mucosal surface, which appears as a large red tumor in the midline of the lower abdomen.