Deficiency, sphingomyelinase means: Cells called reticuloendothelial cell in the liver, spleen, and in other types of cells throughout the body include the nerve ganglion cells and the central nervous system.
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What else does Deficiency, sphingomyelinase mean?

Niemann-Pick disease is known for its neurological symptoms, which include spasticity and seizures as well as mental retardation. The disease slows down physical growth. Hepatosplenomegaly and jaundice are some of the gastrointestinal symptoms. Niemann-Pick disease’s eye features include a “cherry red spot” at the centre of the retina, an opaque cornea, and brown discoloration in the lens capsule. Pulmonary infiltration is a common problem. Early signs of coronary artery disease are common. It is possible to bruise easily.
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The bone marrow and lymph nodes contain typical cells, called Niemann-Pick cell. They have a foamy appearance because they store sphingomyelin. This helps in diagnosing the condition.
(in Medical Dictionary)

Sphingomyelinase Deficiency: Also known as Niemann-Pick Disease, it is an abnormality in the metabolism of a fat called sphingomyelin. It usually leads to progressive liver and splenomegaly hepatosplenomegaly and “swollen glands lymphadenopathy” and other conditions such as anemia, mental and physical decline, and lymphadenopathy.
(in Medical Dictionary)

Named after the German doctors Albert Niemann (1880-1921) and Ludwig Pick (1868-1944), The disease is also known as sphingomyelinase deficiencies.
(in Medical Dictionary)

There are at least five forms of Niemann Pick disease: The classical infantile form A, the visceral form B, the subacute juvenile form C, the Nova Scotian variation type D and the adult form E.
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Sphingomyelin is caused by a deficiency in the enzyme sphingomyelinase. This gene, and the place where it is located in the chromosome 11p15.4–p15 region of the genome, encodes this enzyme.
(in Medical Dictionary)

Niemann-Pick is a hereditary disease that follows an autosomal recessive path. Each child, regardless of gender, is born to a parent who carries one copy of Niemann-Pick’s gene. Niemann-Pick’s classic form usually begins in infancy.
(in Medical Dictionary)