how to cite this article: schulz a, kohlschütter a. ncl disorders: frequent causes of childhood dementia. iran j child neurol. 2013 winter;7(1):1-8. abstract dementia in children or young adults is most frequently caused by neuronal ceroidlipofuscinoses (ncl), a group of incurable lysosomal storage disorders linked by the accumulation of a characteristic intracellular storage material and progr...