Pantothenate kinase-associated neurodegeneration (PKAN, OMIM#234200, formerly known as Hallervorden–Spatz syndrome), an autosomal recessive disease caused by mutations in the PANK2 [1], is classified into two subtypes, namely, classic and atypical phenotype [2]. The gene discussed is PANK2; the disease is pantothenate kinase-associated neurodegeneration.