Neurodegeneration with brain iron accumulation is a heterogenous group of inherited neurodegenerative diseases, still under research, in which iron accumulates in the basal ganglia, either resulting in progressive dystonia, parkinsonism, spasticity, optic atrophy, retinal degeneration, neuropsychiatric, or diverse neurologic abnormalities. Some of the NBIA disorders have also been associated with several genes in synapse and lipid metabolism related pathways. NBIA is not one disease but an entire group of disorders, characterized by an accumulation of brain iron, sometimes in the presence of axonal spheroids in the central nervous system. Iron accumulation can occur anywhere in the brain, with accumulation typically occurring in globus pallidus, substantia nigra, pars reticula, striatum and cerebellar dentate nuclei. Symptoms can include various movement disorders, neuropsychiatric issues, seizures, visual disturbances, and cognitive decline, usually in different combinations. Ten to fifteen genetic NBIA disorders involving various cell processes have been identified: iron metabolism, coenzyme A biosynthesis, phospholipid metabolism, ceramide metabolism, lysosomal disorders, as well as mutations in genes with unknown functions. Onset can occur at different ages, from early childhood to late adulthood. As of 2021 there were no curative treatments for any of the NBIA disorders, though several medications have been subject to clinical trial including the iron chelator deferiprone.

Reference
Wiki: Neurodegeneration with brain iron accumulation