Type of Preparation: Conventional Magnification: Medium Clinical History: 29 year old woman, LMP 1 month, routine exam Interpretation: Atypical endocervical cells, favor neoplastic Cytomorphologic Criteria: Sheet of crowded cells with increased N/C ratios and mitotic activity. Note feathering at edges of the sheet. Explanatory Notes: Some features of endocervical adenocarcinoma in situ are present but they fall just short of an unequivocal diagnosis. Follow-up: Endocervical adenocarcinoma in situ