Low field MR findings and diagnostic value of ovarian endometrial cyst

Objective:To investigate the low-field MR features of ovarian endometrial cyst and its diagnostic value.Methods:24 patients with endometriosis of the ovary were examined with the low-field MR plain scan and B-type ultrasonic inspection.All of them were confirmed by pathology.Results:There were 63 ovarian endometrial cysts of 32 ovary in 24 patients,unilateral ovarian cysts in 16 cases and bilateral in 8 cases;Single cyst was found in 21 cases,42 cysts in 11 ovaries with multiple cysts;Of these,8 cases had small cysts outside of the giant cyst;5 with multiple septations in cysts.Cysts appeared as hyperintensity on T1WI and T2WI in 23 cysts(30.2%),hyperintensity on T1WI and hypointensity or equel intensity on T2WI in 19(30.2%),heterointensity on T2WI in 17(27.0%),isointensity or hypointensity on T1WI and hyperintensity on T2WI in 4.There were 6 cysts with smooth margin,19 with partial smooth margin and partial coarse margin,38 with coarse margin.Low-field MR appeared ovarian endometrial cyst before operation in 63 patients.60 cases were confirmed by histopathology,3 cases were diagnosed as cystadenoma by histopathology.In B-type ultrasonic inspection,50 cases appeared ovariaendometrial cyst.8 cases can not be determined the nature.No focus was found in 5 cases.Conclusion:The detection rates of ovariaendometrial cyst are 100%(63/63),95%(60/63) respectively by Low-field MR and B-type ultrasonic inspection.Specificity is espectively 95%(60/63),79%(50/63).Low-field MR has a distinct advantage over type-B ultrasonic in doiagnosis of ovarian endometrial cyst.