Graves' Disease in Eutopic Thyroid with Ectopic Mediastinal Thyroid Tissue: Role of Single Photon Emission Computed Tomography-Computed Tomography.

Ectopic thyroid is a rare embryological aberration due to defective migration. Most patients with ectopic thyroid tissue have absent thyroid gland in normal anatomical position and present with hypothyroidism. We present a patient with Graves' disease in the eutopic thyroid with ectopic thyroid tissue in the mediastinum and usefulness of single-photon emission computed tomography-computed tomography.