Abstract
WITHIN the past decade and particularly within the past 5 years, an unusual form of hyperthyroidism has received increasing attention (1–22). The hyperthyroid manifestations are generally self limiting, although some cases relapse, are accompanied by chronic inflammatory changes within the thyroid parenchyma, and are marked by a very low 131I uptake. Despite the usually abrupt onset of symptoms and the diffuse lymphocytic infiltration, thyroidal pain and/or tenderness is completely absent. Because this syndrome overlaps many of the features of both lymphocytic thyroiditis and subacute thyroiditis, there has been much debate about how to categorize it or whether to consider it a new disease entity. Nomenclature used by the several groups describing it includes: painless thyroiditis (7, 11, 17, 20), silent thyroiditis (3, 9, 19, 22), occult subacute thyroiditis (1), painless subacute thyroiditis (10, 14), subacute nonsuppurative thyroiditis (2), atypical (“silent”) subacute thyroiditis (16), lymphocytic thy...
Published Version
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