We report the morphologic description of the bile acid sequestrants (BAS) colesevelam and
colestipol, as well as the largest series of cholestyramine. Histologically similar medication
resins from 4 institutions were prospectively collected over 1 year (26 specimens, 15
patients). Comorbidities included hyperlipidemia (4/15), hypertension (4/15), inflammatory
bowel disease (4/15), coronary artery disease (3/15), diarrhea (7/15), hypothyroidism (2/15),
and ischemic bowel (1/15). Sites of involvement included the esophagus (1/26), stomach …