MRI findings of ovarian endometroid adenocarcinoma

Objective:To investigate the MRI findings of ovarian endometrioid adenocarcinoma(OEC)and to improve the understanding of OEC.Methods:Twenty patients with OEC proven by surgery and pathology underwent MRI.MRI features of the tumors including location,morphology,size,characteristics of mass,mural nodule,signal intensity,enhancement,peritoneal implant,ascites,double primary carcinoma(DPC,which is primary OEC accompanied synchronously with endometrial carcinoma),endometrial polyps,endometriosis,and clinical staging were evaluated.Results:Of the 20 patients,22masses were assessed,with unilateral ovarian masses in 18patients(90%)and bilateral masses in the remaining 2(10%).Ten(50%)patients had accompanied endometrial carcinoma(DPC).The masses usually appeared as oval in shape in 13masses(59%)with the maximum diameter as(11.1±5.2)cm(ranging from 3.7cm to 22.5cm).Fifteen(68%)masses were mainly cystic with mural nodules,5(23%)were mixed cystic-solid and 2(9%)were solid.The cystic component showed homogeneous iso-/hyperintensity(17patients 85%)on T1 WI,homogeneous hyperintensity on T2WI(15patients,75%)and hypointensity on DWI(10/16,63%).The solid components of tumors showed isointensity(100%)on T1 WI,heterogenous hyperintensity on T2WI(19/22,86%)and hyperintensity on DWI(14/17,82%).When the appearances of mass was oval shape,mainly cystic with mural nodules,and the signal intensity of cystic component with homogeneous iso-/hyperintensity on T1 WI,the accuracy for diagnosing OEC was 59%,68%and 85%,respectively.When the above-mentioned three features were considerd in combination,the accuracy for the diagnosis was 91%.Conclusion:On MRI,OEC had certain characteristic features,which are helpful for the diagnosis when combination with DWI was performed.