Masaoka-Koga staging
Oncology, staging and radiology
Also known as: Masaoka-Koga-Klassifikation (Thymom) · Masaoka-Koga evrelemesi · Masaoka-Koga staging of thymoma and thymic carcinoma
What it is for
Surgical-pathological staging of thymic epithelial tumours (thymoma and thymic carcinoma) based on invasion through the tumour capsule into surrounding structures and on metastasis.
Classification
| Category | Description |
|---|---|
| Stage I | grossly and microscopically completely encapsulated tumour. |
| Stage IIa | microscopic transcapsular invasion. |
| Stage IIb | macroscopic invasion into thymic or surrounding fatty tissue, or grossly adherent to but not breaking through the mediastinal pleura or pericardium. |
| Stage III | macroscopic invasion into a neighbouring organ (pericardium, great vessels or lung). |
| Stage IVa | pleural or pericardial metastases (dissemination). |
| Stage IVb | lymphogenous or haematogenous metastasis. |
Source
The Masaoka-Koga stage classification for thymic malignancies: clarification and definition of terms
ITMIG · J Thorac Oncol 2011;6(7 Suppl 3):S1710–S1716 (Detterbeck FC et al.)
DOI: 10.1097/JTO.0b013e31821e8cff
PMID: 21847052
- Edition
- Masaoka 1981, Koga modification 1994, terms defined by ITMIG 2011; the formal TNM classification for thymic tumours (UICC/AJCC 8th and 9th edition) now exists alongside it
- Checked on
Summary of the published classification in our own words. Not a substitute for the original publication.
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