Fig. 20

Gastritis due to checkpoint inhibitor therapy (Nivolumab). CT scans in arterial (a) and venous (b) phase showing linear enhancement of the gastric mucosa and diffuse, marked edematous thickening of the submucosal layer, more evident in the prepiloric area with concentric stenosis of the antral lumen. Moderate perigastric fat stranding is appreciable. The stenotic visceral segment is confirmed at barium fluoroscopy (c, d), however the passage of the contrast medium at the level of duodenum and small intestine is allowed