Papillary thyroid cancer (papillary thyroid carcinoma,[1] PTC) is the most common type of thyroid cancer,[2] representing 75 percent to 85 percent of all thyroid cancer cases.[1] It occurs more frequently in women and presents in the 20¨C55 year age group. It is also the predominant cancer type in children with thyroid cancer, and in patients with thyroid cancer who have had previous radiation to the head and neck.[3] It is often well-differentiated, slow-growing, and localized, although it can metastasize.

Reference
Wiki: Papillary thyroid carcinoma