An adenoma is a tumor. It is a benign tumor but it has the potential of becoming cancerous. Therefore, when they are found, they are always removed. In Image A you see a bulky red V-shaped adenoma tumor in the duodenum just beyond the duodenal cap, the first portion of the duodenum. Biopsies confirmed that it was at least an adenoma. The fear was that there was cancer in it somewhere. Surgery was performed and the lesion was removed. No cancer was found.