Rationale: A patent urachus is a rare congenital anomaly that atypically presents as an umbilical cord cyst or large umbilical cord. Here we describe a case of a giant umbilical cord cyst in a newborn diagnosed as a patent urachus.
Patient Concerns: A male infant with a birth weight of 3260 g was transferred because of an antenatally diagnosed giant umbilical cord cyst accompanied by yellowish discharge and granulation in the umbilical cord after birth.