Examination of a 26-year-old female patient revealed a node in the right lobe of thyroid gland. The node appeared no earlier than 3 months ago. The patient associates this node with stress. She doesn't complain either about pain or enlargement of the node. Ultrasonic scanning revealed a 2x2,5 cm large node in the inferior part of the right lobe of thyroid gland. What treatment should be administered?