This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Persistent urachus is a risk factor for 
Select and explain. 
A. Transitional cell ca of bladder, B. Adenocarcinoma of bladder, C. Squamous cell ca of bladder, D. Undifferentiated ca of bladder
B: Adenocarcinoma of bladder
Answer: B: Adenocarcinoma of bladder 
Explanation: 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 SRB's manual of surgery 5th edition