Which defect presents with protrusion of the bladder through an abdominal wall defect and often includes an omphalocele, genital malformations, and meningomyelocele?

• A. Bladder exstrophy
• B. Cloacal exstrophy
• C. Eagle-Barrett syndrome
• D. Hypospadias

Answer: (B)

Cloacal exstrophy represents the most severe end of the exstrophy-epispadias spectrum, where the bladder and other abdominal contents protrude through an abdominal wall defect and are often associated with an omphalocele, genital malformations, and a meningomyelocele. This pattern comes from failed caudal embryologic closure that affects the cloacal membrane and the neural tube, leading to the combination of bladder exstrophy with intestinal/exstrophy components, genital anomalies, and spinal defects.

Bladder exstrophy alone lacks the omphalocele and meningomyelocele, which is why it isn’t the correct choice here. Eagle-Barrett syndrome has a different presentation with severe abdominal wall weakness and urinary tract anomalies but not the specific combination of bladder exstrophy with omphalocele and meningomyelocele. Hypospadias is a penile urethral opening abnormality without these associated abdominal wall or spinal findings.