<prompt> About papillary carcinoma what is trueOften encapsulatedPrognosis badLymph node metastases is commonIodine deficiency is a impoant risk factor  <response>: Papillary thyroid cancer is most common thyroid cancer and has the best prognosis. Not commonly encapsulated. Spreads commonly by lymphatic route. Irradiation is the impoant risk factor . Iodine deficieny is a impoant risk factor for follicular cancer. Source : Sabiston 20th edition Pg : 902 