Acquired hypothyroidism due to iodine deficiency in an American child.

Acquired hypothyroidism secondary to iodine deficiency is rarely reported in iodine-replete environments. The case of a 9-year-old patient with severe acquired hypothyroidism due to iodine deficiency is presented. His deficiency occurred because of a restrictive diet used to control eosinophilic esophagitis. Hypothyroidism and iodine deficiency were quickly corrected with a kelp supplement.