masked hyperthyroidism

masked hy·per·thy·roid·ism

hyperthyroidism occurring without the usual manifestations, especially lack of hyperactivity and ocular findings, often with hypoactivity, even somnolence. Manifestation can be limited to heart failure.
References in periodicals archive ?
Hamburger WM, Lev MW: Masked hyperthyroidism. JAMA 1930; 94:2050-2056