Neck ultrasound:
Solid mass in left thyroid measuring 2.1 x 2.0 x 1.9 cm, displaying heterogeneous echotexture, irregular borders, and internal flow. Between the thyroid and the left SCM muscle, a semisolid mass was demonstrated, with a diameter of up to 3.3 cm with two types of components: one measuring 2.5 in diameter, with internal flow; the other, elastic and without internal flow - thrombus? The exophytic mass displaces the cervical blood vessels medially. No sign of SCM muscle involvement.