Figure 3. Histopathological findings of Case 3: Simple papillary proliferation, showing apparent mucinous metaplasia.

A. A cystically dilated glandular lumen contained several detached cellular clusters, some of which had cellular tufts on their surfaces. B. In this case, mucinous metaplastic changes were prominent. Although they were also observed in the lining of the epithelium, metaplastic mucinous epithelium was more noticeable in floating cellular clusters. The cytoplasm was granular and amphiphilic to basophilic, which is consistent with endocervical-type mucinous epithelium. The epithelial cells covering the papillae had preserved nuclear polarity, had little variation in nuclear size and shape, had uniform nuclear chromatin, and lacked conspicuous nucleoli.