Extensive Mongolian spots: a clinical sign merits special attention for gm1-Gangliosidosis
Abstract
GM1-gangliosidosis (GM1) is one of the metabolic storage diseases, of which a differential diagnosis requires an array of biochemical assays to determine the enzyme deficiency. This approach is not only time-consuming and costly but also unavailable to most hospital laboratories. However, a presumptive diagnosis of GM1 may be made on the basis of diffuse ecchymosis, ectopic Mongolian spots and coarse facial feature, if present. A more definitive diagnosis of GM1 is then made on the demonstration of deficiency of GM1 beta-galactosidase in leukocytes, plasma or cultured skin fibroblasts. We postulate that dermal pigmentation may be recognized as an early sign of GM1 gangliosidosis.
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