Table 1.
Epithelial tumours
| Thymoma | |
| Type A thymoma, including atypical variant | 8581/3* |
| Type AB thymoma | 8582/3* |
| Type B1 thymoma | 8583/3* |
| Type B2 thymoma | 8584/3* |
| Type B3 thymoma | 8585/3* |
| Micronodular thymoma with lymphoid stroma | 8580/1* |
| Metaplastic thymoma | 8580/3 |
| Other rare thymomas | |
| Microscopic thymoma | 8580/0 |
| Sclerosing thymoma | 8580/3 |
| Lipofibroadenoma | 9010/0* |
| Thymic carcinoma | |
| Squamous cell carcinoma | 8070/3 |
| Basaloid carcinoma | 8123/3 |
| Mucoepidermoid carcinoma | 8430/3 |
| Lymphoepithelioma-like carcinoma | 8082/3 |
| Clear cell carcinoma | 8310/3 |
| Sarcomatoid carcinoma | 8033/3 |
| Adenocarcinomas | |
| Papillary adenocarcinoma | 8260/3 |
| Thymic carcinoma with adenoid cystic carcinoma-like features | 8200/3* |
| Mucinous adenocarcinoma | 8480/3 |
| Adenocarcinoma, NOS | 8140/3 |
| NUT carcinoma | 8023/3* |
| Undifferentiated carcinoma | 8020/3 |
| Other rare thymic carcinomas | |
| Adenosquamous carcinoma | 8560/3 |
| Hepatoid carcinoma | 8576/3 |
| Thymic carcinoma, NOS | 8586/3 |
| Thymic neuroendocrine tumours | |
| Carcinoid tumors | |
| Typical carcinoid | 8240/3 |
| Atypical carcinoid | 8249/3 |
| Large cell neuroendocrine carcinoma | 8013/3 |
| Combined large cell neuroendocrine carcinoma | 8013/3 |
| Small cell carcinoma | 8041/3 |
| Combined small cell carcinoma | 8045/3 |
| Combined thymic carcinomas | |
| Germ cell tumours of the mediastinum | |
| Seminoma | 9061/3 |
| Embryonal carcinoma | 9070/3 |
| Yolk sac tumour | 9071/3 |
| Choriocarcinoma | 9100/3 |
| Teratoma | |
| Teratoma, mature | 9080/0 |
| Teratoma, immature | 9080/1 |
| Mixed germ cell tumours | 9085/3 |
| Germ cell tumours with somatic-type solid malignancy | 9084/3 |
| Germ cell tumours with associated haematological malignancy | 9086/3* |
| Lymphomas of the mediastinum | |
| Primary mediastinal large B-cell lymphoma | 9679/3 |
| Extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) | 9699/3 |
| Other mature B-cell lymphomas** | |
| T lymphoblastic leukaemia / lymphoma | 9837/3 |
| Anaplastic large cell lymphoma (ALCL) and other rare mature T- and NK-cell lyphomas | |
| ALCL, ALK-positive (ALK+) | 9714/3 |
| ALCL, ALK-negative (ALK−) | 9702/3 |
| Hodgkin lymphoma | 9650/3 |
| B-cell lymphoma, unclassifiable, with features intermediate between diffuse large B-cell and classical Hodgkin lymphoma | 9596/3 |
| Histiocytic and dendritic cell neoplasms of the mediastinum | |
| Langerhans cell lesions | |
| Thymic Langerhans cell histocytosis | 9751/1 |
| Langerhans cell sarcoma | 9756/3 |
| Histiocytic sarcoma | 9755/3 |
| Follicular dendritic cell sarcoma | 9758/3 |
| Interdigitating dendritic cell sarcoma | 9757/3 |
| Fibroblastic reticular cell tumour | 9759/3 |
| Indeterminate dendritic cell tumour | 9757/3 |
| Myeloid sarcoma and extramedullary acute myeloid leukaemia | 9930/3 |
| Soft tissue tumours of the mediastinum | |
| Thymolipoma | 8850/0 |
| Lipoma | 8850/0 |
| Liposarcoma | |
| Well-differentiated | 8850/3 |
| Dedifferentiated | 8858/3 |
| Myxoid | 8852/3 |
| Pleomorphic | 8854/3 |
| Solitary fibrous tumour | 8815/1 |
| Malignant | 8815/3 |
| Synovial sarcoma | |
| Synovial sarcoma, NOS | 9040/3 |
| Synovial sarcoma, spindle cell | 9041/3 |
| Synovial sarcoma, epithelioid cell | 9042/3 |
| Synovial sarcoma, biphasic | 9043/3 |
| Vascular neoplasms | |
| Lymphangioma | 9170/0 |
| Haemangioma | 9120/0 |
| Epitheloid hemangioendothelioma | 9133/3 |
| Angiosarcoma | 9120/3 |
| Neurogenic tumours | |
| Tumours of peripheral nerves | |
| Ganglioneuroma | 9490/0 |
| Ganglioneuroblastoma | 9490/3 |
| Neuroblastoma | 9500/3 |
| Ectopic tumours of the thymus | |
| Ectopic thyroid tumours | |
| Ectopic parathyroid tumours | |
| Other rare ectopic tumours | |
a)
The morphology codes are from the International Classification of Diseases for Oncology (ICD-O). Behaviour is coded / 0 for benign tumours; / 1 for unspecified, borderline, or uncertain behaviour; / 2 for carcinoma in situ and grade III intraepithelial neoplasia; and / 3 for malignant tumors.
b)
The classification ist modified from the previous WHO classification,1 taking into account changes in our understanding of these lesion.
*
These new codes were approved by the IARC/WHO Committee for ICD-0.
**
This can be any mature B cell lymphoma and the respective ICD-O code from the WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues.10