Imaging diagnosis of pregnancy-associated ovarian tumors

Objective: To investigate the possibility of prediction of the histological type of ovarian tumors by preoperative imaging in patients had undergone surgery for pregnancy-associated ovarian tumors. Methods: Maternal ovarian tumor was detected by ultrasonography (USG) examination and magnetic resonance image (MRI) and operation was performed in 18 pregnant women. In 18 cases, collected medical records, USG/MRI and pathologic findings were analyzed retrospectively. Results: Histopathological diagnoses were parovarian cyst, simple cyst, mucinous cystadenoma, a combination of mucinous cystadenoma and mature cystic teratoma, mature cystic teratoma, hemorrhagic lutein cyst, immature teratoma (Grade1), a combination of mucinous cystadenocarcinoma and mature cystic teratoma. The rate of agreement between the tissue pattern predicted by USG and the histopathological diagnosis was 25%. Matching rate for dermoid cysts was 37.3%. Immature teratoma (G1) could not be predicted preoperatively, but a combination of mucinous cystadenocarcinoma (G1) and mature cystic teratoma was diagnosed as ovarian cancer and a low malignant potential case by some gynecologists. MRI was useful