Thyroid gland
Thyroid cancer
World Health Organization (WHO) classification

Author: Shahidul Islam, M.D., Ph.D. (see Authors page)

Revised: 30 January 2017, last major update March 2009

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PubMed Search: WHO classification of thyroid cancer
Cite this page: World Health Organization (WHO) classification. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/thyroidwho.html. Accessed March 29th, 2017.
WHO (2004)
  • Thyroid carcinomas:
    • Papillary carcinoma
    • Follicular carcinoma
    • Poorly differentiated carcinoma
    • Undifferentiated (anaplastic) carcinoma
    • Squamous cell carcinoma
    • Mucoepidermoid carcinoma
    • Sclerosing mucoepidermoid carcinoma with eosinophilia
    • Mucinous carcinoma
    • Medullary thyroid carcinoma
    • Mixed medullary and follicular cell carcinoma
    • Spindle cell tumor with thymus-like differentiation (SETTLE)
    • Carcinoma showing thymus-like differentiation (CASTLE)

  • Thyroid adenomas and related tumors:
    • Follicular adenoma
    • Hyalinizing trabecular tumor

  • Other thyroid tumors:
    • Teratoma
    • Primary lymphoma and plasmacytoma
    • Ectopic thymoma
    • Angiosarcoma
    • Smooth muscle tumors
    • Peripheral nerve sheath tumors
    • Paraganglioma
    • Solitary fibrous tumor
    • Follicular dendritic cell tumor
    • Langerhans cell histiocytosis
    • Secondary tumors of the thyroid