Masaoka staging

Masaoka staging

A system that is used clinically to stage thymomas, and is the most important determinant of survival post surgical resection; it is comprised of four stages (the last of which contains two sub-stages):
▪ Stage I—Intact thymic capsule;
▪ Stage II—Capsular invasion into adjacent mediastinal fat or pleura;
▪ Stage III—Macroscopic invasion into adjacent organs and vessels;
▪ Stage IVa—Dissemination in thoracic cavity (i.e pleural or pericardial implants); and
▪ Stage IVb—Distant metastases.

Stage II and above are regarded as thymic carcinoma.
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References in periodicals archive ?
This was done because Masaoka staging alone can miss the true oncologic implications of thymoma; in fact, recurrence may appear in a fairly great percentage of patients with early stage thymoma.
Do they agree with our words of caution about considering the Masaoka staging system as the only predictive variable?
We have discussed the various histological classifications for thymomas as well as the widely accepted postsurgical Masaoka staging, which is an independent predictor of outcome and survival.