Figure 1. Histopathological findings of Case 1: Simple papillary proliferation, incidentally detected.

A. Several cystically dilated glandular lumina contained papillary invaginations and floating cellular clusters. B. Grouped, dilated endometrial glands were embedded within the stroma. C. The epithelial cells lining the dilated glandular lumen were a single layer of columnar epithelial cells with frequent apical cytoplasmic snouts. D. The slender papillae had relatively well-defined fibrovascular stromal cores, and were rarely branched. Variable-sized, intraluminal floating clusters of epithelial cells were also seen. E. Cytologically, the majority of the epithelial cells had no cytologic atypia, had preserved nuclear polarity, had uniform nuclear chromatin pattern, and had no prominent nucleoli.