Fig. 3

Histopathological findings. a Papillary tumors with cyst formation which presented mucin secretion were detected, and the Rokitansky-Aschoff sinus was formed (hematoxylin-eosin staining, × 40). b The smooth muscle became hyperplastic in the stromal tissue surrounding the papillary tumors (circle) (hematoxylin-eosin staining, × 100). b Epithelial cells. The nucleus chromatin increased, the karyotype was irregular, and the nuclear body became clear, showing low-grade dysplasia. (Hematoxylin-eosin staining, × 400)