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This is a very fascinating symptom where patients complaint about passing air and bubbles while they urinate.

All we need to know for the purpose of the USMLE is the differential diagnosis:

Vesicocolic fistula is the number one cause where fistula develops between the colon and the bladder and the most common cause of that is diverticular disease of the sigmoid colon. Therefore, a CT abdomen is a good idea to find the diverticular mass.

Other causes of such a fistula development is Crohn's disease and cancers of the colon or the bladder.
 

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anybody came across with this type of question in NBME or in a qbank?.. they even mention it in Diverticular disease but not in chrons.
 
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