This patient had hoarseness of voice of 1 year's duration. A chest X ray showed displacement of the trachea.

1. Is the thyroid gland larger then normal? What is the normal weight of the thyroid?

2. What is the main architectural abnormality of the gland?

3. What are the microscopic features?

4. Why was the gland removed?

5. How can this lesion be diagnosed clinically?