Analysis of the diagnosis and misdiagnosis of pelvic endometriosis with CT and MRI

Objective:To study the value of CT and MRI in the diagnosis of pelvic endometriosis.Methods:A retrospective analysis of the CT and MRI features in 29 cases with pathology proven pelvic endometriosis were performed,the imaging findings were correlated with pathology,and concentration was placed at those misdiagnosed cases.Twelve cases underwent CT scanning and 17 cases had MRI before surgery.Results:The ectopic endometria contained normal endometrial glands and stroma,which was the same as normal endometrium under light microscope.Of the 12 cases with CT,5cases(41.6%)were misdiagnosed.Of which,3cases were misdiagnosed as functional cyst and 2cases as cystadenoma.One case(5.9%)was misdiagnosed as bilateral adnexitis.Of the 17 cases with MRI scan,only 1case was misdiagnosed as bilateral adnexitis.Conclusion:Pelvic endometriosis can be accurately diagnosed on CT and MRI.However,the accuracy of MRI was higher than that of CT.Differential diagnosis included functional cyst accompanied with hemorrhage,cystadenoma and adnexitis.Accuracy of diagnosis could be improved by careful observation of imaging features,in combination with the understanding of history of dysmenorrheal.