Type of Preparation: Histology Magnification: Medium Interpretation: Endocervical adenocarcinoma in situ (AIS) /HSIL Explanatory Notes: Co-existing glandular and squamous lesions should always be considered when making an interpretation of endocervical adenocarcinoma in situ. Follow-up: HSIL (moderate dysplasia) and endocervical adenocarcinoma in situ occurring at the transformation zone