A birth defect in which the URINARY BLADDER is malformed and exposed, inside out, and protruded through the ABDOMINAL WALL. It is caused by closure defects involving the top front surface of the bladder, as well as the lower abdominal wall; SKIN; MUSCLES; and the pubic bone.

Synonyms: Exstrophies, Bladder, Extrophies, Bladder, Bladder Exstrophies, Exstrophy, Urinary Bladder, Exstrophy, Bladder, Bladder Extrophies, Bladder Exstrophy, Urinary Bladder Exstrophy, Exstrophy of the Bladder, Exstrophy Of Bladder, Bladder Extrophy, Exstrophies, Urinary Bladder, Extrophy, Bladder, Urinary Bladder Exstrophies