History of present illness A 60-year-old female presented with a neck mass for 10 years but did not see physician at that time because she thought it was due to obesity. Two months ago, she noticed an enlarging mass at the same location. The mass is growing very rapidly and lately causing dysphagia and difficulty of breath so she came to Chulalongkorn hospital for admission.
Physical examination A large nodule is detected on the thyroid gland.
Fine-needle aspiration shows … (See figure 1, 2 )
Questions 1. What is your diagnosis? 2. What is the cell of origin of the neoplasm? 3. Describe gross and microscopic findings of this lesion. 4. What is the prognosis of this tumor? 5. Do you think the symptom that she experienced ten years ago related to her present illness?