Sadat Alavi, Mehr Medullary and papillary carcinoma of the thyroid gland occurring as a collision tumor with lymph node metastasis: A case report. [electronic resource] - Journal of medical case reports Dec 2011 - 590 p. digital Publication Type: Journal Article ISSN: 1752-1947 Standard No.: 10.1186/1752-1947-5-590 doi