RESUMEN
Objective To investigate the MRI manifestations of secondary toxoplasmosis encephalitis in HIV patients and summarize the characteristics of MRI changes.Methods MRI images of 3 5 HIV patients with secondary toxoplasmosis encephalitis were analyzed retrospectively.Results Of 35 patients,27 showed multiple lesions and 8 showed single lesion.Lesions mainly involved the brain gray matter j unction or basal ganglia.MRI showed lamellar,nodular or round lesions,which showed low signal on T1WI,and slightly higher and unevenly high signal on T2WI.Irregular liquid signal or nodular slightly lower signal was showed on T2WI in 14 cases,and short T1signal was showed in 15 cases.Circular lesions could be seen"cattle eye"in 18 cases.For 11 cases of enhanced scan of a single lesion,a ring enhancement was displayed,and coexistence of patchy,nodular and annular enhancement were showed in multiple lesions,in which parts of the multi-circular enhancemens were clustered.Conclusion MRI manifestations of HIV patients with secondary toxoplasmosis encephalitis show primarily multiple lesions on the gray matter j unction or basal ganglia.The lesions show high signal on T1WI and"cattle eye"on T2WI,and existence of flaky,nodular and ring enhanced lesion or clustered enhancement are showed on enhanced imaging,which is of a certain specificity.