We report the unusual case of an 87-year-old woman with cardiac myxoma
and adenomatous goiter. She exhibited slight elevations of serum inte
rleukin-6 (IL-fi), but levels of thyroid hormones such as T-3, free T-
3 and free T-4 were all abnormally low. Interleukin-6 may potentiate t
he alteration of thyroid metabolism.