Two rare cases of benign struma ovarii with malignant recurrence oleh Kanella Kantreva, Stavroula A Paschou, Katerina Stefanaki, Kanella Pappa, Paraskevi Kazakou, Dionysios Vrachnis, Evangelia Kavoura, Kitty Pavlakis, Eirini Giovannopoulou, Konstantinos Lathouras, Maria Alevizaki, Katerina Saltiki