Infantile neuroaxonal dystrophy (INAD, NBIA2A; MIM# 256600) is a major subtype of PLA2G6-associated neurodegeneration (PLAN), a heterogenous group of clinical disorders which additionally includes atypical neuroaxonal dystrophy (NBIA2B; MIM# 610217) and adult-onset dystonia-parkinsonism (PARK14; MIM# 612953). This evidence concerns the gene PLA2G6 and neurodegeneration with brain iron accumulation 2B.