Lipid Storage Disorders Workup
- Author: Lynne Ierardi-Curto, MD, PhD; Chief Editor: Bruce Buehler, MD more...
Laboratory Studies
Diagnosis of lipid storage disorders depends on demonstration of specific enzymatic deficiency in peripheral blood leukocytes or cultured fibroblasts.
Imaging Studies
- Brain imaging
- Brain imaging studies are frequently obtained during evaluation of infants and children with developmental delay or retrogression. However, they are not essential to diagnosis, which depends on demonstration of specific enzymatic deficiency in peripheral blood leukocytes or cultured fibroblasts.
- Findings vary with different disorders.
- Skeletal radiographs
- In GM1 gangliosidosis, skeletal abnormalities are similar to those associated with mucopolysaccharidoses. They include anterior beaking of vertebrae, enlargement of sella-turcica and thickening of calvaria.
- In Gaucher disease type 1, more than half of patients have radiological evidence of skeletal involvement including an Erlenmeyer flask deformity of the distal femur.
- In patients with symptomatic bone disease, lytic lesions can develop in long bones like the femur, ribs, and pelvis. Osteosclerosis may be evident at an early age.
- Chest radiograph
- Patients with Niemann-Pick disease (NPD) typically have fine reticular-nodular infiltrates.
- Findings are not associated with clinical pulmonary disease in young patients but can be accompanied by pulmonary dysfunction later in life.
- Abdominal radiograph: Patients with Wolman disease typically have calcification of the adrenal noted on abdominal radiograph.
Other Tests
Genetic testing
- For most disorders, carrier identification and prenatal diagnosis are available. Making a specific diagnosis in an affected child is important in order to provide genetic counseling.
- More recently, investigators have focused efforts on determining molecular basis. These studies have resulted in identification of specific disease-causing mutations, allowing for improved diagnosis, prenatal diagnosis and carrier identification.
- For some disorders (eg, Gaucher disease), it is possible to make genotype-phenotype correlations that predict disease severity and allow more precise genetic counseling. Thus, determination of genotype is recommended when possible.
Histologic Findings
- Examination of tissues reveals pathologic storage of substrate in many tissues including liver, bone marrow and, for some disorders, the brain.
- Gaucher disease has a pathologic hallmark, which is the Gaucher cell in the reticuloendothelial system, particularly in bone marrow. Cells, which are 20-100 µm in diameter, have a wrinkled-paper appearance resulting from presence of intracytoplasmic inclusions of substrate. Cytoplasm reacts strongly positive with periodic acid-Schiff stain. Presence in bone marrow and organ tissue specimens is highly suggestive of Gaucher disease, although it can be found in patients with granulocytic leukemia and myeloma.
- NPD types A, B, and C have a pathological hallmark, which is histochemically lipid-laden foam cells, often called Niemann-Pick cells.[4] These cells can be readily distinguished from Gaucher cells by their histologic and histochemical characteristics. They are not pathognomonic for NPD because histologically similar cells are found in patients with Wolman disease, cholesterol ester storage disease, lipoprotein lipase deficiency, and GM1 gangliosidosis type 2.
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