has part has core process realizes disease Niemann-Pick disease type A course of Niemann–Pick disease type A and type B course of Niemann–Pick disease type A PMID:16434659 PMID:24488099 The totality of all processes through which the Niemann–Pick disease type A is realized. This causal process is heredity. https://ghr.nlm.nih.gov/condition/niemann-pick-disease https://omim.org/entry/257200 retinal degeneration [Niemann Pick Disease Type A] pulmonary infection [Niemann Pick Disease Type A] sphingomyelin metabolism imbalance [Niemann Pick Disease Type A] severe sphingomyelin accumulation in lysosome [Niemann Pick Disease Type A] splenohepatomegaly [Niemann Pick Disease Type A] hypofunction of nervous system functioning [Niemann Pick Disease Type A] sphingomyelinase gene mutation [Niemann Pick Disease Type A] dysfunction of sphingomyelin degradation [Niemann Pick Disease Type A] sphingomyelin biosynthetic process[Niemann Pick Disease Type A] sphingomyelin homeostasis imbalance [Niemann Pick Disease Type A]