Thymoma Classification/Lists
Intrinsic Tumors of the Thymus
- Thymoma
- Type A
- Type AB
- Type B1
- Type B2
- Type B3
- Other types
- Micronodular with lymphoid stroma
- Metaplastic
- Sclerosing
- With prominent signet ring like features
- Thymic carcinoma
- Low grade
- Well differentiated squamous
- Basaloid
- Adenocarcinoma
- Adenosquamous
- Low grade mucoepidermoid
- Micronodular
- High grade
- Lymphoepithelial-like
- Large cell undifferentiated
- Clear cell
- Sarcomatoid
- Midline carcinoma with t(15;19)
- Low grade
- Thymic neuroendocrine carcinoma
- Well differentiated (carcinoid)
- Poorly differentiated
- Small cell
- Large cell
- Miscellaneous
Non-Thymic Neoplasms that May Arise Primarily in the Thymus
- Hematopoietic
- Primary mediastinal large B cell lymphoma
- Extranodal marginal zone lymphoma
- Precursor T lymphoblastic lymphoma/leukemia
- Hodgkin lymphoma
- Germ cell tumors
- Seminoma (Germinoma)
- Embryonal carcinoma
- Yolk sac tumor
- Teratoma
- Choriocarcinoma
- With associated somatic type malignancy
- Embryonal rhabdomyosarcoma
- Angiosarcoma
- Others
- With associated hematologic malignancy
- Acute myelogenous leukemia
- Acute megakaryoblastic leukemia
- Others
Miscellaneous Thymic Lesions and Conditions
- Atrophy
- Cysts
- Most are non-specific
- Neoplasms most commonly associated with cysts
- Castleman disease
- Dysplasia
- Hyperplasia
- B cell/lymphoid/germinal center
- Rebound
- True thymic
- Microscopic thymoma / nodular hyperplasia of thymic epithelium
- (Ectopic hamartomatous thymoma)