Abstract
Macrocephaly, enlarged head size, can be seen in a wide range of conditions including
hydrocephalus and genetic syndromes. Benign familial macrocephaly may be seen in multiple
generations and is not associated with neurologic concerns. When macrocephaly is seen
in conjunction with abnormal white matter on neuroimaging, specific genetic leukoencephalopathies
should be considered, including Alexander's disease, Canavan's disease, childhood
ataxia with central hypomyelination/ vanishing white matter disease (CACH/VWMD), glutaric
aciduria type I, L2-hydroxyglutaric aciduria, and megalencephalic leukoencephalopathy
with subcortical cysts (MLC).
Keywords
leukoencephalopathy - leukodystrophy - macrocephaly - megalencephaly