Editing Duodenum (section)

===Cancer===
Duodenal cancer is a cancer in the first section of the small intestine. Cancer of the duodenum is relatively rare compared to [[stomach cancer]] and [[colorectal cancer]]; malignant tumors in the duodenum constitute only around 0.3% of all the gastrointestinal tract tumors but around half of cancerous tissues that develop in the small intestine.<ref>{{cite book |last1=Fagniez |first1=Pierre-Louis |last2=Rotman |first2=Nelly |title= Malignant tumors of the duodenum |year=2001 |publisher=Zuckschwerdt |url=https://www.ncbi.nlm.nih.gov/books/NBK6953/}}</ref> Its histology is often observed to be [[adenocarcinoma]], meaning that the cancerous tissue arises from glandular cells in the [[epithelial tissue]] lining the duodenum.<ref>{{cite web |title=Definition of adenocarcinoma - NCI Dictionnary of Cancer Terms |url=https://www.cancer.gov/publications/dictionaries/cancer-terms/def/adenocarcinoma |access-date=12 July 2024 |website=National Cancer Institute}}</ref>