<prompt> Persistent urachus is a risk factor forTransitional cell ca of bladderAdenocarcinoma of bladderSquamous cell ca of bladderUndifferentiated ca of bladder  <response>: Sepsis, tuberculosis, adenocarcinoma of bladder can occur in patients with patent urachus. Patent urachus with urine leak signifies obstruction distal to bladder. Reference : page 1029 SRBs manual of surgery 5th edition 