The coexistence of psoriasis vulgaris, Sjögren's syndrome, and Hashimoto's thyroiditis.

A 52-year-old woman presented with psoriasis vulgaris, Sjögren's syndrome, and Hashimoto's thyroiditis with a 5-year history. She had a number of immunological abnormalities and typical psoriatic plaques over her entire body. The relationship between psoriasis, Sjögren's syndrome, and Hashimoto's thyroiditis is discussed from the viewpoint of immunology, and similar cases in the literature are reviewed. This is the first report of a coexistence of psoriasis vulgaris, Sjögren's syndrome, and Hashimoto's thyroiditis.