<prompt> Which type of thyroid carcinoma has the best prognosisPapillary CaAnaplastic CaFollicular CaMedullary Ca  <response>: In general pts. with PTC Papillary Thyroid Carcinoma have an excellent prognosis with a greater than 95 10-year survival rate. Papillary carcinoma of thyroid is a slow growing tumor, usually not associated with blood borne metastasis, and hence has a better prognosis than the other varieties. Follicular, Medullary and Anaplastic carcinomas are all associated with a greater incidence of blood borne metastasis and a poorer prognosis. Ref : Schwaz Surgery 9e p1362 