Thymoma type B1
Thymoma type B1
Definition
A thymic epithelial neoplasm characterized by the presence of expanded areas which resemble the normal thymic cortex. The neoplastic epithelial cells are small and scant and there is a dense T-lymphocytic component present. Areas of medullary differentiation with or without Hassall's corpuscles are also present. It may be associated with myasthenia gravis, pure red cell aplasia, and hypogammaglobulinemia. It has a low grade malignant potential. The majority of cases occur in the anterior mediastinum as Masaoka stage I tumors. A minority of the cases occur as stage II tumors.
Also known as lymphocyte-predominant thymoma, lymphocyte-rich thymoma, organoid thymoma, predominantly cortical thymoma, thymoma type B1 — per MONDO
Also identified as
Affected Organs
| Organ | Involvement | Source |
|---|---|---|
| Respiratory system | Disease Has Associated Anatomic Site | NCIT · CC BY 4.0 |
| Thymus | Disease Has Associated Anatomic Site | NCIT · CC BY 4.0 |
| Thymus | Disease Has Primary Anatomic Site | NCIT · CC BY 4.0 |