A very rare case of submucosal invasive duodenal adenocarcinoma in a patient with a history of radiation therapy.

Adenocarcinomas of the small intestine are rare compared with other gastrointestinal carcinomas. The patient's history of radiation therapy could also have facilitated the invasion of this tumor into the submucosa. This case illustrates that, although the model of the adenoma-carcinoma sequence is believed to apply to the small intestine, as well as to the large intestine, submucosal invasive duodenal carcinomas are extremely rare. [Extracted from the article]