| 21. | Thirteen other syndromes may exhibit signs similar to Usher syndrome, including Alport syndrome, Alstrom syndrome, Bardet-Biedl syndrome, Cockayne syndrome, spondyloepiphyseal dysplasia congenita, Flynn-Aird syndrome, Friedreich ataxia, Hurler syndrome ( MPS-1 ), Kearns-Sayre syndrome ( CPEO ), Norrie syndrome, osteopetrosis ( Albers-Schonberg disease ), Refsum's disease ( phytanic acid storage disease ), and Zellweger syndrome ( cerebrohepatorenal syndrome ).
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