Fig. 1

Radiologic, macroscopic, and microscopic findings at the initial surgery. a Magnetic resonance imaging (MRI) findings before first surgery. b, c Macroscopic findings of right ovarian tumor at initial surgery. d Hematoxylin and eosin staining (scale bar: 250 μm, × 100 magnification). Immunohistochemical analysis of e H3K27me3 (Barr body, scale bar: 25 μm, × 400 magnification), f CK7 (scale bar: 100 μm, × 200 magnification), g CDX2 (scale bar: 100 μm, × 200 magnification), and h PAX8 (scale bar: 100 μm, × 200 magnification)