Ectopic Cervical Thymic Tissue Mimicking Parathyroid Hyperplasia: A Rare Occurrence Linked to Graves Disease.

Thymic hyperplasia has occasionally been reported in patients with Graves disease (GD). However, ectopic cervical thymic hyperplasia in the setting of hyperthyroid GD is exceptionally rare. We describe a case of a 54-year-old Thai woman who presented with hyperthyroidism, diplopia, and pretibial myxedema.