Fig. 3

a The tumor was composed of nests of major epithelioid cells with necrotic debris (○) and peritumoral hyaline-like material, accompanied by scattered choriocarcinoma components (△) (Hematoxylin-Eosin (H&E) stain, original magnification × 200). b Focal positive cytoplasmic staining for β-human chorionic gonadotropin (original magnification × 200). c Cytoplasmic staining for inhibin-α was positive (+) in choriocarcinoma trophoblasts and negative (−) in epithelial trophoblasts (original magnification × 200). d Nuclear staining for p63 was positive (+) in both epidermoid trophoblasts and choriocarcinoma trophoblasts (original magnification × 200)