Review Question - QID 214918

A 45-year-old woman presents to your clinic due to a lump on her neck. She first noticed the lump 2 weeks ago and does not think it has changed in size since then. The patient denies any dysphagia, palpitations, tremors, hair or nail changes, or heat intolerance. She has a history of type 1 diabetes for which she takes insulin. The patient’s temperature is 98.8°F (37.1°C), blood pressure is 128/76 mmHg, pulse is 80/min and regular, and respirations are 16/min. Physical exam reveals an anxious-looking woman without tremors, peripheral edema, or lid lag. Cardiac auscultation is unremarkable. There is a firm, mobile, 1 cm mass at the base of her neck slightly to the left of midline. Which of the following is the most appropriate next step in management?