sialidosis /sī′əlidō″sis/ , a neuronal storage disease of children caused by a deficiency of the enzyme sialidase (neuraminidase). The condition is characterized by a cherry-red spot on the macula, progressive myoclonus, and seizures. There are two types. Type 1 patients have normal physical features and beta-galactosidase levels. Type 2 patients also have short stature, bony abnormalities, and beta-galactosidase deficiency.
