The article “Treatment of Thyrotoxicosis,” by Iagaru and McDougall (J Nucl Med. 2007;48:379–389), contained some errors. On page 380, in the fourth line from the bottom of the right column, “1,500 mm” should be “1,500/mm3.” On page 382, in the seventh line from the bottom of the left column, “160 mCi” should be “160 μCi.” On page 383, in the twelfth line from the top of the left column, “MBq” should be “MBq/g” and “μCi” should be “μCi/g.”