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Masaoka staging system

Dr Yuranga Weerakkody et al.

The Masaoka staging system is a staging system which is commonly adopted for thymomas ^1-3 and is the most important determinant of survival following surgical resection ⁴.

stage I : intact thymic capsule
stage II : capsular invasion into adjacent mediastinal fat or pleura.
stage III : mascroscopic invasion into adjacent organs, vessels
stage IV :
- IVa : dissemination in thoracic cavity (i.e pleural or pericardial implants)
- IVb : distant metastases.

Stage II and above are regarded as thymic carcinoma ².

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