Norman & Tingey (1966) reported a new syndrome of micrencephaly, strio-cerebellar calcifications and leucodystrophy and in 1968, Lyon & col. reported the same syndrome plus dwarfism. These authors did not describe cerebrospinal fluid (CSF) alterations. In 1984, Aicardi & Goutièrres described 8 children from 5 different families with a syndrome like above referred to but with chronic CSF lymphocytosis; all patients had a progressive evolution, with familial character, with probable autosomic recessive heritage. It is the purpose of this report to relate a case similar to Aicardi & Goutièrres' cases in a male Caucasian patient of jewish ashkenazim origin with 6 and a half month of age, but with a study of CSF lymphocytes T and B. Diminished T-subpopulations of active and avid-T were found suggesting local signalization of antibodies in the central nervous system. The differential diagnosis and that strange combination of a probable genetic etiology and an immunitary process revealing a local inflammatory process are discussed.