Monarch Disease Ontology term MONDO_0009561 (alpha-mannosidosis) is an inherited lysosomal storage disorder characterized by immune deficiency, facial and skeletal abnormalities, hearing impairment, and intellectual deficit. Also known as: Alpha-D-mannosidosis, alpha-mannosidase deficiency, deficiency of alpha-mannosidase, lysosomal alpha-D-mannosidase deficiency, mannosidosis, alpha-, types I and II.