Type of Preparation: SurePath/ LBP Magnification: Medium Clinical History: 25 year old female Interpretation: Endocervical adenocarcinoma in situ (AIS) Cytomorphologic Criteria: Numerous clusters of abnormal glandular cells containing crowded cells with elongated nuclei. Note pseudostratification of cells and feathering at the periphery of the clusters. Explanatory Notes: In liquid-based preparations, the pseudostratified strips of cells often present as short "bird-tail" arrangements. (see linked image). Follow-up: Endocervical adenocarcinoma in situ