Masaoka-Koga Staging System for Thymoma
Stage I Tumor completely encapsulated
Stage IIa Microscopic tumor invasion into capsule
Stage IIb Tumor invasion into surrounding fat
Stage III Tumor invasion into a neighboring organ such as the pericardium, great vessel, or lung
Stage IVa Pleural or pericardial dissemination
Stage IVb Lymphatic or hematogenous metastasis
Stage I Tumor completely encapsulated
Stage IIa Microscopic tumor invasion into capsule
Stage IIb Tumor invasion into surrounding fat
Stage III Tumor invasion into a neighboring organ such as the pericardium, great vessel, or lung
Stage IVa Pleural or pericardial dissemination
Stage IVb Lymphatic or hematogenous metastasis
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