Fig. 1

The tumors showed an infiltrative pattern of stromal invasion growing in sheets or nests. Representative area of serous differentiation: these atypical cells had large round to oval nuclei (a, 10×, b, 20×). Representative area of ovarian serous carcinomas with squamous differentiation: the tumor cells had severe nuclear pleomorphism with eosinophilic cytoplasm and numerous mitotic figures (c, 10×, d, 10×, e ×20, f ×40)