Fig. 3
Histological examination of the excised cyst. a The cyst was tortuous (hematoxylin and eosin staining; low magnification). b Tissue is evident, but the cyst-lining cells are unclear; endometrium-like tissue is observed in the cystic wall (hematoxylin and eosin staining; high magnification). c Podoplanin-positive cyst-lining cells are clearly observed after immunohistochemical staining (immunoperoxidase stain with hematoxylin counterstain; high magnification). d Epithelial cells and stromal cells are positive for estrogen receptors after immunohistochemical staining (immunoperoxidase stain with hematoxylin counterstain; high magnification). b, c, and d are magnified images of the area within the frame in (a)