In CC-EIC, nuclear pleomorphism and mitotic activity are typically milder than serous carcinoma [1], Ki67 may be lower [19], and most CC-ECs lack TP53 mutations [1]; however, the combination of the typical morphological/immunohistochemical features, as seen in our cases, would still allow a correct diagnosis. Here, MKI67 is linked to serous adenocarcinoma.