Jodbasedow and thyrotoxic periodic paralysis.

A 37-year-old white man with a multinodular goiter had thyrotoxicosis develop after iodine administration (Jodbasedow). His hyperthyroid state was accompanied by thyrotoxic periodic paralysis, a complication of hyperthyroidism that is usually seen in Orientals. The patient manifested typical features of each disorder. As classically described, these two thyroid-related disorders should rarely coexist because of epidemiologic considerations; however, the population at risk may be greater than has generally been appreciated.