TY - JOUR T1 - Uncommon Causes of Thyrotoxicosis JF - Journal of Nuclear Medicine JO - J Nucl Med SP - 265 LP - 278 DO - 10.2967/jnumed.107.041202 VL - 49 IS - 2 AU - Erik S. Mittra AU - Ryan D. Niederkohr AU - Cesar Rodriguez AU - Tarek El-Maghraby AU - I. Ross McDougall Y1 - 2008/02/01 UR - http://jnm.snmjournals.org/content/49/2/265.abstract N2 - Apart from the common causes of thyrotoxicosis, such as Graves' disease and functioning nodular goiters, there are more than 20 less common causes of elevated free thyroid hormones that produce the symptoms and signs of thyrotoxicosis. This review describes these rarer conditions and includes 14 illustrative patients. Thyrotropin and free thyroxine should be measured and, when the latter is normal, the free triiodothyronine level should be obtained. Measurement of the uptake of 123I is recommended for most patients. ER -