Ovarian Malignant Teratoma:Ultrasound Findings and Misdiagnosis Analysis / 中国医学影像学杂志

ABSTRACT

Purpose To analyze the ultrasound manifestation of ovarian malignant teratoma, and to evaluate its diagnostic value and explore reasons for its misdiagnosis. Materials and Methods A retrospective study was conducted on the ultrasound findings of 25 patients with ovarian malignant teratoma confirmed surgically and pathologically (22 with immature teratoma, 3 with teratoma with malignant transformation). Their ultrasound imaging features were summarized and the reasons for misdiagnosis were further analyzed. Results The ultrasound imaging of 22 immature teratoma cases were divided into three types, namely, predominant solid components, predominant fluid components and mixed components of fluid and solid. All displayed calcification-like strong echo scattering in the low echo;color Doppler showed rich blood signal, little signal or no blood flow signal. Preoperative ultrasound presented1 case of immature teratoma (4.5%), 8 cases of ovarian tumors (malignant) (36.4%) and 13 cases of other diagnosis (59.1%). As to the 3 cases of teratoma with malignant transformation, the ultrasound imaging showed 2 cases were composed by fluid and solid components and that 1 case was mature cystic teratoma;typical hypoecho suggested malignant transformation. Preoperative ultrasound did not present teratoma with malignant transformation. Conclusion The ultrasound findings of ovarian malignant teratoma seem to be complicated and variable;thus the preoperative diagnosis rate is low though it still shows certain characteristics.