ABHD12 and cerebellar ataxia: Polyneuropathy, hearing loss, ataxia, retinitis pigmentosa, and cataract (PHARC)3 (OMIM 612674) is a rare autosomally recessive neurological disorder caused by homozygous or compound heterozygous mutations in the Abhd12 gene on chromosome 20p11 in humans (1, –, 4).