A lesion with cytological characteristics associated with invasive adenocarcinoma but the tumor cells are confined to the GLANDULAR EPITHELIAL CELLS of origin. Adenocarcinoma in situ of the CERVIX and the LUNG are the most common.

Synonyms: Situ, Adenocarcinoma in, Adenocarcinoma in Situs, Preinvasive Adenocarcinomas, Preinvasive Adenocarcinoma, Adenocarcinoma in Situ, Adenocarcinomas, Preinvasive, Intraepithelial Adenocarcinomas, in Situ, Adenocarcinoma, Adenocarcinomas, Intraepithelial, Adenocarcinoma, Preinvasive, Adenocarcinoma, Intraepithelial, Intraepithelial Adenocarcinoma