Thyroid Ultrasound > Top 10 Pathology > 8. Hashimoto's Thyroiditis

Hashimoto's Thyroiditis

Hashimoto thyroiditis is a common autoimmune disease in which patients, predominantly women, develop antibodies to thyroglobulin and the thyroid peroxidase enzyme. They present with painless enlarged thyroid usually in a hypothyroid state. 

It causes a characteristic sonographic pattern of diffusely coarse echotexture with innumerable tiny hypoechoic nodules that may become confluent, interspersed with echogenic fibrous bands. Vascularity may be increased, decreased, or normal, and FNA is usually not necessary for diagnosis.

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