A thyroid neoplasm of mixed papillary and follicular arrangement. Its biological behavior and prognosis is the same as that of a papillary adenocarcinoma of the thyroid. (From DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1271). The disease is Monarch Disease Ontology term MONDO_0006886 (thyroid gland papillary and follicular carcinoma). Also known as: papillary and follicular adenocarcinoma, papillary and follicular carcinoma.