[Occurrence of fibrosis in subacute de Quervain thyroiditis].

Subacute thyroiditis of de Quervain is histologically characterized by an inflammatory reaction with histiocytes and giant cells around residues of colloid, producing a tubercle-like granulomatous picture. A variable degree of fibrosis occurs, but recovery is generally almost complete. Investigation of a series of thyroid glands with de Quervain's thyroiditis gave the impression of rather extensive and increasing fibrosis in most of these glands. To substantiate this impression we reviewed the histological slides of all our cases of de Quervain's thyroiditis diagnosed at the Department of Pathology of the University of Zurich between 1940-1950 and 1974-1984. In the majority of the glands of both periods we found rather extensive fibrosis involving more than 50% of the surface. In young patients the fibrosis seemed to be more extensive than in older subjects. There was no sex difference. A certain degree of fibrosis appears to be characteristic of de Quervain's thyroiditis. Differences of frequency and degree of fibrosis between the two periods could not be demonstrated.