Niemann-Pick disease is an inherited metabolic disorder where lipids are not able to be metabolized adequately and hence build up and cause damage in various parts of the body such as the spleen, liver, lungs, bone marrow and brain. The different types of the disease are due to different genetic mutations. Type B is a chronic form of the condition with no neurological involvement and patients can survive into adulthood. See also Niemann-Pick disease, type B