Hashimoto Thyroiditis

• Etiology: Autoimmune thyroiditis
• Imaging US:
  — Initially thyroid gland diffusely enlarged with heterogenous echotexture
  — Hypoechoic micronodules with surrounding echogenic septations or hyperechoic micronodules with surrounding hypoechoic septations (pseudonodular pattern)
• Imaging US Color Doppler: Usually normal or decreased flow on US Color Doppler but occasionally may be hypervascular
• DDX:
• Complications: At higher risk for papillary thyroid carcinoma so discrete nodule should be biopsied
• Treatment: Life-long L-thyroxine (T4)
• Clinical: Usually present with hypothyroidism and goiter

Radiology Cases of Hashimoto Thyroiditis