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the turning inside out of an organ, such as the urinary bladder.
exstrophy of the bladder 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 its posterior wall showing through the opening in the anterior wall.
exstrophy of cloaca (cloacal exstrophy) a developmental anomaly in which two segments of bladder (hemibladders) are separated by an area of intestine with a mucosal surface, resembling a large red tumor in the midline of the lower abdomen.
hemibladder/hemi·blad·der/ (hem´e-blad″er) a half bladder, as in exstrophy of the cloaca; the urinary bladder is formed as two physically separated parts, each with its own ureter.
a half bladder; a developmental anomaly in which the bladder is formed as two physically separated parts, each with its own ureter.