Nivolumab-induced tumour-like gastritis: A case report

Figure 1 Esophagogastroduodenoscopy findings before and after treatment. A: First esophagogastroduodenoscopy before treatment (February 2021). Fibrinous debris on the mucosa, suspected infiltrating neoplasm; B: Second esophagogastroduodenoscopy before treatment (March 2021). Gastric mucosa prone to bleeding upon contact with mucous debris; C: Third esophagogastroduodenoscopy after the first course of omeprazole (July 2021). Diffuse erythematous gastropathy; D: Fourth esophagogastroduodenoscopy after the third course of omeprazole (January 2022). Atrophic mucosa with intestinal metaplasia.