Physical examination of a 3-day-old male infant reveals urine leaking from the area of the umbilicus. Which of the following is the most likely diagnosis ? (AIIMS May 2014)
a. The cloaca is an embryonic structure that connects ventrally to the allantoic stalk and laterally to the mesonephric ducts.
b. At about the eighth week of development a cloacal membrane forms within the cloaca and separates the cloaca into a dorsal rectum and a ventral urogenital sinus.
c. The latter is the origin of the urachus, urinary bladder, and proximal urethra. Initially, the urinary bladder is continuous with the allantois, which constricts and forms the thick, fibrous urachus.
d. The urachus, in turn, becomes attenuated, but still remains attached to the bladder dome and forms the median umbilical ligament in the adult.
e. Incomplete attenuation of the urachus (persistent urachus) can lead to formation of a urachal cyst, urachal sinus, or urachal fistula.
f. The end attached to the bladder can remain and form a bladder diverticulum, while the central portion can remain and form a urachal cyst.
g. Urachal sinuses and fistulas still connect the umbilicus to the urinary bladder, and therefore urine can leak at the site of the umbilicus.