Challenging diagnosis of groove pancreatitis with severe gastric outlet obstruction: A case report

Figure 3 Esophagogastroduodenoscopy findings. A: A mass-like lesion located at the pyloric antrum to the duodenal bulb with complete obstruction, preventing the esophagogastroduodenoscopy scope from passing through the duodenal bulb; B: Esophagogastroduodenoscopy performed to biopsy the suspected ampulla of Vater cancer showing no ampulla of Vater mass, but instead a duodenal bulb mass-like lesion.