Intramucosal Adenocarcinoma

**Semantic type:** Neoplastic Process

**Definition:** A neoplastic lesion that shows morphologic evidence of invasion into the lamina propria or muscularis mucosa. There is no evidence of invasion into the submucosa. Evidence of invasion may refer to stromal invasion by single cells or clusters of cells, presence of atypical and complex glandular architectural patterns beyond those that are present in normal mucosa, desmoplasia, and/or vascular invasion.