A 30-year-old male with long-standing Crohn disease presents with abdominal pain. A CT scan reveals an abnormal connection between the ileum and the bladder. This is an example of:
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Correct answer: A fistula
Fistulas are abnormal tracts between two epithelial-lined organs. In Crohn disease, transmural inflammation leads to deep ulcers that penetrate the entire wall, creating connections between bowel loops (enteroenteric) or other organs like the bladder (enterovesical).
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