[Hyperthyroidism and cholestasis: a case report].

Intrahepatic cholestasis has rarely been observed in patients with thyrotoxicosis and generally occurs in association with coexistent congestive heart failure. We report the case of a 63-year-old man who was referred to our Institution because of jaundice and hyperthyroidism. During his hospital stay, his plasma bilirubin level reached 27.41 mg/dL. Clinical, biohumoral, and instrumental examinations excluded heart failure and autoimmune or viral hepatitis. After the start of therapy with methimazole, thyroid hormone and plasma bilirubin levels decreased progressively and simultaneously, eventually returning to normal. Plasma bilirubin values as high as the ones we recorded, in the absence of congestive heart failure or autoimmune chronic hepatitis, have not, to our knowledge, been previously reported.