Mixed neuroendocrine-nonneuroendocrine neoplasm of the ampulla: Four case reports

Figure 2 Enhanced magnetic resonance imaging of the abdomen and duodenoscopy of patient 3. A: The orange arrow shows an oval mass in the ampulla, which shows high signal intensity on diffusion weighted imaging and the boundary is still clear; B: After the mass is enhanced, it shows uneven ring enhancement; C: An irregular ulcer in the ampulla was seen under the endoscopy, with a crater-like bulge around it.