[Cerebral MRI in the study of prognostic factors in AIDS.  Hypotheses from tests on 15 patients]. 
In an attempt to determine factors of predictive value in HIV (human immuno-deficiency virus) seropositive patients, particular attention was payed to symptoms indicating early involvement of the central nervous system (CNS).  A cohort of healthy carriers was thus constituted.  Follow-up will be carried out every six month including clinical, biological as well as CNS imaging by NMR.  Among the first 15 of them, abnormalities could be observed in 4 individuals.  Lesions consisted in nodules of high signal in T2 which were localized either in the white matter or thalamic nuclei.  No relationship could be demonstrated between the existence of these lesions and various criteria such as age, sex, risk factors and T4 cells count.  Such lesions appeared similar to the localizations observed in multiple sclerosis or to the scars of limited vascular accidents.  The nature of these lesions is not clear.  They certainly indicate early involvement of CNS after primary infection by the HIV virus.  They may either represent sequellae of this primary infection or early alterations announcing developing encephalopathy.