Aase’s syndrome /äz/ [Jon Morton Aase, American pediatrician, b. 1936] , a familial syndrome characterized by mild delayed growth, hypoplastic anemia, heart defects, variable leukocytopenia, triphalangeal thumbs, narrow shoulders, and late closure of fontanels, and occasionally by cleft lip, cleft palate, retinopathy, and web neck. Autosomal-dominant transmission has been suggested.