The urachus is the result of allantois obliteration. Failure to obliterate the allantois results in various urachal anomalies, some of which can cause clinical manifestations. Typical clinical symptoms in children are periumbilical fluid (42%), umbilical mass (30%), abdominal or periumbilical pain (22%), and rarely dysuria (2%). Clinical symptoms in adults include umbilical drainage, umbilical mass, omphalitis, cyst infection, abdominal pain, hematuria, dysuria, and may be asymptomatic.
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