Table 2.

The 2022 WHO classification of follicular cell derived thyroid neoplasms

1. Benign tumors

Thyroid follicular nodular disease

Follicular adenoma

Follicular adenoma with papillary architecture

Oncocytic adenoma of the thyroid

2. Low-risk neoplasms

Noninvasive follicular thyroid neoplasm with papillary-like nuclear features

Thyroid tumors of uncertain malignant potential

Hyalinizing trabecular tumor

3. Malignant neoplasms

Follicular thyroid carcinoma

Invasive encapsulated follicular variant papillary carcinoma

Papillary thyroid carcinoma

Oncocytic carcinoma of the thyroid

Follicular-derived carcinomas, high-grade   Differentiated high-grade thyroid carcinoma   Poorly differentiated thyroid carcinoma

Anaplastic follicular cell–derived thyroid carcinoma

Adapted from [24^▪▪].