Acute thyroiditis

43 year old female with known history of hypothyroidism under medication.
She complained of tenderness over the thyroid gland and difficulty swallowing.
Ultrasound scan showed diffusely enlarged thyroid lobes with lobulated margin and  heterogenous echotexture. The echogenicity is generally reduced, and vascularity is increased.
No retrosternal extension.
Findings are consistent with acute thyroiditis.