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WHO classification of thyroid tumours (1988)
I. Epithelial tumours
- Benign
- Follicular adenoma and variants
- Others including hyalinizing trabecular adenoma
- Malignant
- Follicular carcinoma including minimally invasive, widely invasive and poorly differentiated subtypes
- Papillary carcinoma and variants including papillary microcarcinoma, follicular variant and diffuse sclerosing variant
- Medullary carcinoma and variants including mixed medullary-follicular carcinoma
- Undifferentiated (anaplastic) carcinoma
- Others
II. Non-epithelial tumours
- Benign
- Malignant
- Angiosarcoma
- Others