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A contrast swallow study, in which a radio-opaque dye is swallowed by the patient and x-rays taken, often shows the anatomy of the fistula. If the fistula involves the colon, a contrast enema (contrast dye given through the rectum) may be useful.
A CT scan of the abdomen is usually obtained to determine if an abscess -- a walled-off pocket of infection -- is associated with the fistula.
A "fistulogram," in which radio-opaque dye is injected into the opening of the skin of an enterocutaneous fistula and x-rays taken, is often performed as well.
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