Type of Preparation: Conventional Magnification: Medium Interpretation: NILM: Reactive cellular changes associated with IUD Cytomorphologic Criteria: Single partially degenerated epithelial cells with increased nuclear size and high N/C ratio. Explanatory Notes: Single cells may also mimic high grade SIL; however the morphologic spectrum of abnormalities usually present with squamous intraepithelial lesions is absent in cases with single atypical cells due to IUD effect. Also the presence of nucleoli in isolated cells with a high N/C ratio (right) are not typical of HSIL.