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ORPHA:349Disease
Also called Alpha-L-fucosidase deficiency
What it is
A rare lysosomal storage disease characterized by widespread tissue buildup of glycolipids and oligosaccharides rich in fucose. Patients present with broad clinical characteristics such as intellectual disability, developmental delay associated with psychomotor regression and bone abnormalities, visceromegaly, hyperhidrosis, and dermatological abnormalities.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Childhood, Infancy
- Inheritance
- Autosomal recessive
- Classified as
- Disease
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Very common80–99%
17- Abnormal facial shape
- Anterior beaking of lumbar vertebrae
- Brachycephaly
- Coarse facial features
- Dysostosis multiplex
- Failure to thrive
- Generalized hyperkeratosis
- Global developmental delay
- Hearing impairment
- Hepatomegaly
- Hyperhidrosis
- Hypothyroidism
- Intellectual disability, severe
- Kyphosis
- Lipoatrophy
- Mucopolysacchariduria
- Prominent forehead
Common30–79%
9These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
Gene
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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