Figure 6From: Carcinoid tumor of the minor papilla in complete pancreas divisum presenting as recurrent abdominal pain Microscopic examination. A, B, Heterotopic pancreas in the duodenal submucosa and muscularis propria around the minor papilla was noted. There were uniform and round-shaped cells in or around the heterotopic pancreas and they were arranged in a solid nest or tubular pattern. These findings were suggestive of a carcinoid tumor. There was vascular invasion, but no perineural invasion was noted. (H&E stain A: ×10, B: ×100) C, D, According to immunohistochemical staining, the tumor cells were immunoreactive with neuroendocrine markers, such as synaptophysin and chromogranin.(C:Synaptophysin stain ×100; D: Chromogranin stain ×100)Back to article page