Thyroid gland
Thyroid cancer
World Health Organization (WHO) classification

Author: Andrey Bychkov, M.D., Ph.D.

Revised: 9 January 2018, last major update September 2017

Copyright: (c) 2002-2018, PathologyOutlines.com, Inc.

PubMed Search: WHO classification of thyroid cancer
Cite this page: Bychkov, A. World Health Organization (WHO) classification. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/thyroidwho.html. Accessed January 21st, 2018.
WHO (2017)
  • Tumours of the thyroid gland ICD 0 codes
    • Follicular adenoma 8330/0
    • Hyalinizing trabecular tumour 8336/1
    • Other encapsulated follicular patterned thyroid tumours
      • Follicular tumours of uncertain malignant potential 8335/1
      • Well differentiated tumour of uncertain malignant potential8348/1
      • Noninvasive follicular thyroid neoplasm with papillary-like nuclear features 8349/1
    • Papillary thyroid carcinoma
      • Papillary carcinoma8260/3
      • Follicular variant of PTC8340/3
      • Encapsulated variant of PTC8343/3
      • Papillary microcarcinoma8341/3
      • Columnar cell variant of PTC8344/3
      • Oncocytic variant of PTC8342/3
    • Follicular thyroid carcinoma (FTC), NOS8330/3
      • FTC, minimally invasive8335/3
      • FTC, encapsulated angioinvasive8339/3
      • FTC, widely invasive8330/3
    • Hürthle (oncocytic) cell tumours
      • Hürthle cell adenoma8290/0
      • Hürthle cell carcinoma8290/3
    • Poorly differentiated thyroid carcinoma 8337/3
    • Anaplastic thyroid carcinoma 8020/3
    • Squamous cell carcinoma 8070/3
    • Medullary thyroid carcinoma 8345/3
    • Mixed medullary and follicular thyroid carcinoma 8346/3
    • Mucoepidermoid carcinoma 8430/3
    • Sclerosing mucoepidermoid carcinoma with eosinophilia 8430/3
    • Mucinous carcinoma 8480/3
    • Ectopic thymoma 8580/3
    • Spindle epithelial tumour with thymus-like differentiation 8588/3
    • Intrathyroid thymic carcinoma 8589/3
    • Paraganglioma and mesenchymal / stromal tumours
      • Paraganglioma 8693/3
      • Peripheral nerve sheath tumours (PNSTs)
        • Schwannoma9560/0
        • Malignant PNST9540/3
      • Benign vascular tumours
        • Haemangioma9120/0
        • Cavernous haemangioma9121/0
        • Lymphangioma9170/0
      • Angiosarcoma 9120/3
      • Smooth muscle tumours
        • Leiomyoma8890/0
        • Leiomyosarcoma8890/3
      • Solitary fibrous tumour 8815/1
    • Hematolymphoid tumours
      • Langerhans cell histiocytosis 9751/3
      • Rosai-Dorfman disease
      • Follicular dendritic cell sarcoma 9758/3
      • Primary thyroid lymphoma
    • Germ cell tumours
      • Benign teratoma9080/0
      • 9080/1 Immature teratoma9080/1
      • 9080/3 Malignant teratoma9080/3
    • Secondary tumours
  • ICD 0 note: the first four digits indicate the specific histological term; the fifth digit after the slash (/) is the behavior code, including /0 for benign tumors, /1 for unspecified, borderline or uncertain behavior, /2 for carcinoma in situ and grade III intraepithelial neoplasia (not used for adrenal tumors), and /3 for malignant tumors
Diagrams / tables

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Images contributed by Andrey Bychkov, M.D., Ph.D.

WHO classification: thyroid tumors

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