FIGURE 1.

A, Severe gastritis in the body of the stomach (left), severe duodenitis in the duodenal bulb (middle), and severe colitis in the sigmoid colon (right) noted on endoscopy. B, Corpus mucosa with active gastritis and expansile lamina propria lymphoplasmacytic infiltrate (left, arrow), ulcerated duodenal mucosa with vasculitis-like involvement of a blood vessel (middle), and severe active colitis with mucosal ulceration (right) (original magnification ×400). C, Course of laboratory inflammatory markers (green: ferritin, blue: D-dimer, yellow: CRP), stool output (maroon bars), and treatment (gray bars and arrows). IV, intravenous.