A progressive motor neuron disorder characterized by respiratory insufficiency, sensorineural deafness and progressive ponto-bulbar palsy. The disease is riboflavin transporter deficiency (MONDO_0008891, a Monarch Disease Ontology entry). Also known as: Brown-Vialetto-van Laere syndrome, Fazio-Londe syndrome, disorder of riboflavin transmembrane transporter activity, riboflavin transmembrane transporter activity disease, sensorineural hearing loss-pontobulbar palsy syndrome.