Abstract: Objective: To investigate the value of MRI in diagnosis of uterine adenomyosis.Methods: Seventeen cases of adenomyosis confirmed by pathology were performed sagittal,traverse or coronary scans of SE T₁WI,FSE T₂WI,and FIR sequences T₂ SPIR MRI examination,and 2 cases received enhanced scanning.Results: Eight cases with diffuse adenomyosis demonstrated diffusely equably or unequably thickened junctional zone(JZ),5 cases showed homonenous hypointensity with hyperintensive foci within the hypointensive lesions on T₂WI,and 3 cases were found hyperintensive foci on T₁WI.Fifteen focal lesions in 9 cases,whose junctional tone was limitedly thickened,were oval,irrenular or round masses with hypointensity which were the same as the intensity of JZ on T₂WI.Eight of them had hyperintensive foci within the hypointensive and 6 of the 8 also presented hyperintensive on T₁WI.All the cases showed enlargement of uterus,and the cases with myoma of uterus showed bulginess on the outline.All enhanced lesions were thickened as the junction zone.Conclusions: MRI is of great value in diagnosis and localization of uterine adenomysis.