[Chronic autoimmune thyroiditis as a predictor and precursor of metaplasia].

In recent years an increase in the incidence of chronic autoimmune thyroiditis (CAT) and its transformation into thyroid cancer (TC) and thyroid lymphoma (TL) have been recorded. The article discusses etiologic and pathogenetic relationship between CAT, TC, TL, PDS and MEN syndromes. Clinical, laboratory, intrascopic and morphological diagnostics of CAT and comorbidities is considered. The algorithm for the choice of the treatment is presented.