Type of Preparation: SurePath/ LBP Magnification: High Interpretation: HSIL Cytomorphologic Criteria: Isolated dysplastic cells are small and round to oval with scant cytoplasm. Cellular changes are consistent with HSIL and correlate well with a biopsy showing CIS. Explanatory Notes: Isolated, small, dysplastic cells should not be confused with histiocytes or endometrial cells. The presence of similar cells consistent with moderate dysplasia provides a clue as to the nature of the lesion. Follow-up: CIS