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Masaoka Staging System
A staging system for thymoma based on the anatomic extent of disease at the time of surgery. (NCI Thesaurus)
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The tumor shows lymphogenous or hematogenous metastasis to distant sites.
The tumor shows metastasis throughout the pleural and/or pericardial spaces.
The tumor shows invasion into the neighboring tissues and organs of the lower neck or upper chest.
The tumor shows invasion through the capsule and into the surrounding fatty tissue.
The tumor shows microscopic invasion into the capsule.
The tumor is completely encapsulated.
