Type of Preparation: ThinPrep/ LBP Magnification: High Clinical History: 32 year old, routine cervical screening, Day 10 of cycle Interpretation: NILM: Histiocytes Cytomorphologic Criteria: Histiocytes with eccentric round to oval nuclei and foamy cytoplasm. Explanatory Notes: At low power, histiocytes and atypical metaplastic cells may be confused. The rounder shape of most cells in liquid-based preparations as compared to conventional preparations may lead to uncertainty about the cell type, however assessment under high power usually clarifies this.