SAHARAN, S.; SOLANKI, R.; SAHARAN, D. A rare case of collision tumor of thyroid gland: simultaneous occurrence of calcitonin negative medullary thyroid carcinoma and papillary thyroid carcinoma. International Journal of Otorhinolaryngology and Head and Neck Surgery, [S. l.], v. 5, n. 6, p. 1726–1728, 2019. DOI: 10.18203/issn.2454-5929.ijohns20194960. Disponível em: https://www.ijorl.com/index.php/ijorl/article/view/1771. Acesso em: 16 nov. 2025.