Bulbospinal muscular atrophy of childhood

Bulbospinal muscular atrophy of childhood (also referred to as Fazio-Londe disease or progressive bulbar palsy of childhood) is an extremely rare neurodegenerative disorder characterized by progressive weakness of the muscles controlled by the lower cranial nerves (bulbar muscles) and spinal motor neurons. The disease primarily affects the brainstem and spinal cord motor neurons, leading to progressive bulbar palsy with difficulties in swallowing (dysphagia), speech (dysarthria), facial weakness, tongue atrophy and fasciculations, and respiratory compromise. Limb weakness may also develop as the disease progresses, reflecting involvement of spinal anterior horn cells. Onset typically occurs in childhood, and the clinical course is progressive, often leading to severe disability and respiratory failure. Some cases of Fazio-Londe disease have been linked to mutations in the SLC52A3 gene (encoding riboflavin transporter 3) or SLC52A2 gene (encoding riboflavin transporter 2), which are associated with Brown-Vialetto-Van Laere syndrome, a related condition. In these cases, the disorder follows an autosomal recessive inheritance pattern. Recognition of the riboflavin transporter deficiency is clinically important because high-dose riboflavin (vitamin B2) supplementation has shown benefit in some patients, potentially stabilizing or improving neurological symptoms. Early diagnosis and initiation of riboflavin therapy may be critical. Supportive care including respiratory support, nutritional management, speech therapy, and physical therapy are also important components of management. Due to the rarity of this condition, clinical experience is limited and management is largely guided by case reports and small case series.

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