What this covers
Alpha-mannosidosis is an ultra-rare, progressive lysosomal storage disorder caused by a deficiency of the enzyme alpha-mannosidase. Because timely diagnosis allows preventive treatment to begin early, an international panel of experts came together to agree on a practical algorithm to help clinicians recognise the disease and know when to test for it.
Key takeaways
- The panel developed two diagnostic algorithms — one for patients aged 10 years or younger and one for those older than 10 — reflecting how the condition presents differently at different ages.
- In younger patients, hearing impairment and speech delay are the key warning signs, while in older patients intellectual disability, worsening movement problems and psychiatric symptoms should prompt further assessment.
- When the disease is suspected, screening for oligosaccharides in urine or serum and enzyme testing are recommended, with molecular testing used as the final confirmatory step.
Why it matters
A simple, age-based algorithm that can be used in many settings may help clinicians reach a diagnosis sooner, so that treatment can start earlier for people with alpha-mannosidosis.
