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[CMV and VZV encephalitis in AIDS].

MATERIAL AND METHODS
Eighty patients were followed up prospectively. Histological correlation was obtained in 25 cases. All MRI examinations were performed on at 0.5 Tesla in T1-weighted sequences with and without gadolinium injection, and in axial or frontal T2-weighted spin echo sequences. Histological confirmation was obtained 30 days on average after the last MRI examination. Immunohistochemical stainings were performed in search of CMV, VZV, toxoplasma, HIV antigen and lymphoma.


RESULTS
CMV meningoencephalitis was found in 6 cases. In 3 of these it was manifested by atrophy, either isolated or associated with high signal intensity punctiform areas. Histology detected cortical or subcortical microglial nodules. In 2 cases MRI displayed abnormalities of subependymal nodular signals without enhancement, associated with punctiform abnormalities of subcortical signals. Histology showed subependymal foci of necrosis and abnormalities of white matter. In one case, MRI showed a ventriculitis confirmed by histology. VZV meningoencephalitis was diagnosed in 2 cases. MRI displayed abnormal basal ganglia related to meningitis (n = 1). All abnormalities were confirmed at histology.


CONCLUSION
Some images (ventriculitis, infarction in basal ganglia, abnormal subependymal signal) would suggest VZV and CMV encephalitis. Other images (abnormalities of punctiform signals or atrophy) are not specific.