Adult-onset Alexander disease with brainstem and cervical cord enhancing lesions.

Leukodystrophies are a group of genetic diseases with diverse clinical features and prominent involvement of the central nervous system white matter. We describe a 27-year-old man who presented with a progressive neurological disease, and striking involvement of the brainstem and symmetrical white matter lesions on MR scanning. Having excluded several other causes of leukodystrophy, we confirmed Alexander disease when a genetic panel showed a probable pathogenic variant in GFAP : p.Leu359Pro. Clinicians should suspect Alexander disease in people with a progressive neurological motor decline who has pyramidal and bulbar signs and compatible neuroimaging.