"Hashitoxicosis" — "Hashitoxicosis" (a neologism that combines "Hashimoto" and "thyrotoxicosis") is a term used to describe rare patients with autoimmune thyroid disease who initially present with hyperthyroidism and a high radioiodine uptake caused by TSH-receptor antibodies similar to Graves' disease [12] (see "Pathogenesis of Hashimoto's thyroiditis (chronic autoimmune thyroiditis)").