congenital urachal anomaly urachal cyst (disease) GARD:0005425 HP:0012618 ICD10:Q64.4 MESH:D014496 MONDO:0018844 MedDRA:10065375 NCIT:C85216 Orphanet:488 SCTID:17234001 Urachal cyst is a congenital urachal anomaly characterized by a failure of complete closure of the urachus, in which both ends are closed but the central lumen remains patent. It is typically asymptomatic but may become clinically significant when infected, presenting as a mass in the umbilical region accompanied by abdominal pain and fever. urachal cyst