The ribbon sign

The ‘‘ribbon sign’’ is used to describe the appearance of the featureless tubular small bowel in patients with graft vs. host disease (GVHD) on fluoroscopic imaging. Small bowel involvement in patients with GVHD causes bowel wall edema which leads to small bowel wall thickening, fold thickening, and eventually complete effacement of the valvulae conniventes… (More)