A 45-year-old man went to the doctor with complaints of irritability, fatigue, weight loss, palpitations, heart failure. During palpation of the left thyroid lobe the gland is palpated the formation of a dense-elastic consistency, painless, which during swallowing is displaced together with the thyroid gland. Positive eye symptoms, exophthalmos, convergence disorders. Blood pressure - 135/80 mm Hg. Art., pulse - 110/min. During the ultrasound examination of the thyroid gland in the left lobe is visualized hyperechogenic round formation measuring 2 × 3 cm, with clear contours, homogeneous structures. Which conclusion of the doctor after the examination will be the most correct?