20th August 2020

A 40-year-old man is seen by his endocrinologist regarding follow up after his total thyroidectomy with radioiodine

A 40-year-old man is seen by his endocrinologist regarding follow up after his total thyroidectomy with radioiodine. He presented 5 years previously with increasing symptoms of lethargy, sweating, weight loss and diarrhoea. After a few months he also noticed vague bouts of coughing and a couple of instances of haemoptysis. Following biochemical assessment and ultrasound scan, a biopsy of a nodule found on ultrasound scan confirmed the diagnosis. The report described the tumour as being well differentiated, resembling thyroid parenchyma closely. 

For the patient above, please select the SINGLE most likely diagnosis for the thyroid lump present. Select ONE option from the list above.