Fistulous tract to right lower quadrant on barium enema

A barium enema in a 64-year-old man with three weeks of right hip pain reveals extravasation of barium from a perforated sigmoid diverticulum with collection of contrast material in an abscess cavity (arrow) adjacent to the diverticulum. There is a fistulous communication extending from the abscess cavity toward the right lower quadrant to the region of the right hip (arrowhead).