Juvenile Alexander Disease: A Rare Leukodystrophy.

Alexander disease is an uncommon autosomal dominant leukodystrophy that influences the white matter of the central nervous system (CNS), predominantly affecting the frontal lobe bilaterally. The most obvious pathogenic hallmark is the extensive deposition of cytoplasmic inclusions known as "Rosenthal fibers" in perivascular, subpial, and subependymal astrocytes throughout the CNS. The hereditary cause is mutations in the glial fibrillary acidic protein (GFAP) gene. Infantile, adult, and juvenile onsets are the three subtypes. Psychomotor retardation, mile-stone regression, spastic paresis, brain stem symptoms (swallowing, speech, etc.), and seizures define the juvenile variety, which emerges between the ages of three and 10 years. Macrocephaly has a lower likelihood of being a juvenile type. It is generally diagnosed based on clinical and magnetic resonance imaging findings. A five-year-old girl is presented as a case of juvenile Alexander disease, with typical clinical and MRI features.