A very rare case of patent urachus associated with a completely patent omphalomesenteric duct is presented. Although the diagnosis of anomalies and infantile diseases of the umbilicus is not generally considered to be difficult given their clinical signs and contrast radiography, in this case, clinical radiography could not be used to make the diagnosis because of the patient's hypersensitivity to iodine. Treatment of the umbilical remnants involves complete surgical excision and reconstruction of the umbilicus.