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Urachal Remnant
Etiology: urachus is canal connecting bladder of fetus with allantois which is a structure that contributes to formation of umbilical cord, lumen of urachus normally obliterated during embryonic development, transforming urachus into solid cord / functionless remnant — Patent urachus – bladder communicates with umbilicus — Urachal sinus – starts at umbilicus and terminates blindly along tract — Urachal cyst – urachus closed at each end with cyst in middle — Urachal diverticulum – starts at bladder and terminates blindly along tract
Imaging: US to demonstrate findings
Clinical: may have umbilical discharge of pus or urine, inflammed anterior abdominal wall along omphalovesical duct / ligament