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). The gene discussed is PLA2G6; the disease is neurodegeneration with brain iron accumulation 2A.