| Term | Definition |
| Graves' (diffuse toxic goiter) | Hyperthyroidism; lymphocytes; small follicles; little colloid |
| Plummer's (nodular toxic goiter) | Hyperthyroidism; hyperplasia, hypertrophy; colloid accumulation |
| diffuse simple goiter | Hypothyroidism; hyperplasia, hypertrophy; iodine deficiency |
| Hashimoto's | Hypothyroidism; lymphocytes, plasma cells; atrophic follicles; little colloid |
| Riedel's | Hypothyroidism; fibrous replacement |
| De Quervain's | Euthyroid; viral, leakage of colloid, granulomas |
| follicle cells | Thyroid cells; produce T4 and T3 |
| paracollicular C cells | Thyroid cells; make calcitonin |