An infant born at 40 weeks gestational age after an uneventful pregnancy wa
s found to have severe macrocrania at birth, Multicystic encephalomalacia w
as diagnosed based on transfontanellar ultrasonography and magnetic resonan
ce imaging findings. Serum levels of IgM, IgG, and IgA antibodies for Toxop
lasma gondii were elevated in the neonate and his mother. Investigations fo
r other causes were negative. Examination of a cerebrospinal fluid specimen
showed albumin level elevation to 4 g/L. Neither chorioretinitis nor intra
cerebral calcifications were found. There was no response to treatment with
pyrimethamine-sulfadoxine and a systemic glucocorticoid. At last follow-up
, the infant was seven months of age and had intractable epilepsy and profo
und developmental retardation. With reference to this highly unusual case,
the clinical and etiological aspects of multicystic encephalomalacia are re
viewed.