Descending duodenal adenocarcinoma treated with pembrolizumab resulting in complete clinical response: A case report and literature review

Figure 2 After receiving chemotherapy, immediately before pembrolizumab. A: Upper gastrointestinal endoscopy showed a mass in the descending duodenum with numerous violaceous necrotic tissue and blood clots on the surface; B: Computed tomography (CT) showed a duodenal mass with possible retroperitoneal lymph node metastasis; C: CT showed dilated right renal pelvis and abdominal ureter.