Review Question - QID 101931

The urachus is an embryonic structure connecting the bladder to the yolk sac and if it remains patent, a communication exists between the bladder and the umbilicus, resulting in discharge of urine from the umbilicus.

The urachus arises from the allantois, a protrusion of the yolk sac that develops during the 3rd week of gestation and normally obliterates shortly before birth. A urachus may persist as a patent communication as in this patient, or it may present in 3 other ways: a vesicourachal diverticulum (outpouching of bladder), a urachal sinus (a persistent space surrounding the umbilicus that is predisposed to infection), or a urachal cyst (usually asymptomatic).

Incorrect Answers:
Answer 1: Myelomeningocele is when the meninges and spinal cord herniate through a defect in the spinal canal.
Answer 2: Gastroschisis is a congenital defect in which abdominal contents protrude through the abdominal wall, NOT covered by peritoneum.
Answer 3: Omphalocele is a congenital defect in which abdominal contents protrude through the abdominal wall, covered by peritoneum.
Answer 4: Meconium discharge from the umbilicus occurs with a persistent vitelline duct (omphalomesenteric duct).