I. thyroid epithelial tumours

A. Benign: thyroid adenomas

 thyroid follicular adenoma

• thyroid macrofollicular adenoma

 variants
 others thryoid adenomas

• hyalinizing trabecular adenoma

B. Malignant

1. Follicular carcinoma

• minimally invasive
• widely invasive
• poorly differentiated

2. Papillary carcinoma

• papillary microcarcinoma
• follicular variant
• diffuse sclerosing variant

3. Medullary carcinoma

• mixed medullary-follicular carcinoma

4. Undifferentiated carcinoma - anaplastic carcinoma

5. Others

 SETTLE (spindle epithelial tumor with thymus-like differentiation)

II. thyroid non-epithelial tumours

A. Benign B. Malignant

1. Angiosarcoma 2. Others

III. Malignant lymphomas IV. Miscellaneous tumours

Classification

 thyroid carcinomas

• thyroid papillary carcinoma

 Hurthle cell tumors

• Hurthle cell thyroid carcinoma

 C cells tumors

• C cell hyperplasia
• medullary thyroid carcinoma

See also

 thyroid tumorigenesis