All the following statements about Thyroid carcinoma are true, except:
Thyroid lymphoma is often associated with hashimoto's thyroiditis
Papillary ca is multifocal
Medullary ca is associated with MEN2a
Follicular carcinoma spreads mainly by lymphatic
Major spread of follicular carcinoma is through blood, papillary carcinoma through lymphatics. Ref: Harrison's, 18th Edition, Page 2436