Broadly, the disease can be sub-divided into mild and severe types, both very rare, although there is probably a continuum of phenotypes. In the most severe type there is hepatosplenomegaly, severe dysostosis multiplex, deafness, progressive mental retardation and often early death. In the milder form there is a later onset and more prolonged course with less severe dysostosis multiplex and mental retardation, but deafness is a major problem.

Enzyme Tests:
Deficiency of lysosomal
a-mannosidase is the primary defect.

Back to Lysosomal Storage Disorders Index

Back to Alphabetical List of Assays Available