Type of Preparation: ThinPrep/ LBP Magnification: High Clinical History: 73 year old woman with postmenopausal bleeding Interpretation: Atypical endometrial cells Cytomorphologic Criteria: Cluster of small cells with fairly uniform nuclei and inconspicuous nucleoli. Note cytoplasmic vacuoles with ingested neutrophils. Explanatory Notes: Atypical endometrial cells may be associated with the presence of a wide variety of processes, including polyps, chronic endometritis, hyperplasia, and carcinoma. Follow-up: Complex endometrial hyperplasia with extensive mixed metaplasia