A fistulogram is a special type of x-ray used to get a more detailed image of a fistula. During the procedure, a dye is injected into the fistula to make it more visible on x-ray images. If the fistula connects to the outside of the body, a catheter inserts the dye. If the person has a fistula in their rectum, the doctor will inject the dye via the anus before taking x-rays from a variety of angles. This helps doctors to see the fistula from several different positions.

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