thyroid glands are nodular because of areas of hyperplasia (overgrowth). No
symptoms may arise as a result of this condi-tion, but not uncommonly these
nodules slowly increase in size, with some descending into the thorax, where
they cause local pressure symptoms. Some nodules become malignant, and some are
associated with a hyperthyroid state. Thus, the patient with many thyroid
nodules may eventually require surgery.