Microscopic Thymoma / Nodular Hyperplasia of Thymic Epithelium
Differential Diagnosis
- Thymic (Lymphoid) Hyperplasia and True Thymic Hyperplasia bear no resemblance to Nodular Hyperplasia of Thymic Epithelium / Microscopic Thymoma
- The first two are characterized by an increase in lymphocytes while the last is purely epithelial
- Neuroendocrine carcinoma may need to be ruled out with IPOX
| Micronodular Thymoma with Lymphoid Stroma | Microscopic Thymoma / Nodular Hyperplasia of Thymic Epithelium |
|---|---|
| Gross tumor mass | Incidental microscopic finding |
| Epithelial nodules surrounded by lymphocytes | Small epithelial nodule(s) surrounded by normal thymus or fat |
