Type of Preparation: ThinPrep/ LBP Magnification: High Interpretation: HSIL Cytomorphologic Criteria: The dysplastic cells in this field display several criteria for HSIL: high nuclear to cytoplasmic ratio, hyperchromasia, and granular, hyperchromatic chromatin. Combined with the irregular nuclear membranes, these cells are pathognomonic for HSIL. Explanatory Notes: The degree of nuclear atypia exhibited precludes the diagnosis of squamous metaplasia or reactive cellular changes. Follow-up: Biopsy-CIN 3