| Benign | Malignant |
| Multinodular (sporadic) goiter ("colloid adenoma") | Papillary carcinoma |
| Hashimoto's (chronic lymphocytic) thyroiditis | Follicular carcinoma |
| Cysts (colloid, simple, or hemorrhagic) | Minimally or widely invasive |
| Follicular adenomas | Oxyphilic (Hürthle cell) type |
| Macrofollicular adenomas | Noninvasive follicular thyroid neoplasm with papillary-like nuclear features |
| Microfollicular or cellular adenomas | Medullary carcinoma |
| NIFTP (noninvasive follicular tumor with papillary-like nuclear features)* | Anaplastic carcinoma |
| Hürthle cell (oxyphil cell) adenomas | Primary thyroid lymphoma |
| Macro- or microfollicular patterns | Metastatic carcinoma (breast, renal cell, others) |