Neonatal adrenoleukodystrophy (NALD) is the variant of intermediate severity of the PBD-Zellweger syndrome spectrum (PBD-ZSS; see this term), charcterized by hypotonia, leukodystrophy, and vision and sensorineural hearing deficiencies. Phenotypic overlap is seen between NALD and infantile Refsum disease (IRD) (see this term).