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Related to urachal sinus: Urachal cyst
urachal sinusA communicating tract from a patent urachus, which drains to the umbilicus, and causes episodic infections.
Children may present with periumbilical tenderness, pus or granulation tissue at the umbilicus; this last is often linked to multiple applications of silver nitrate, based on the erroneous assumption that the sinus was residual umbilical cord.
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