<prompt> Feaures of medullary carcinoma thyroid:Arises from parafollicular cellsAmyloid stroma is present on histologyDiarrhea occursAll  <response>: Ans is All Some tumours are familial, possibly accounting for 10-20 of all cases.- Bailey Total Thyroidectomy is the treatment of choice for patients with MTC because of high incidence of multicentricity, the more aggressive course and RAI therapy usually being not effective. 