Myasthenia gravis and thymic neoplasms: A brief review

Table 1 World Health Organization histopathological classification

Type	Histologic description
A	Medullary thymoma
AB	Mixed thymoma
B1	Predominantly cortical thymoma
B2	Cortical thymoma
B3	Well-differentiated thymic carcinoma
C	Thymic carcinoma

Table 2 Masaoka-Koga staging system

Stage	Definition
I	Encapsulated tumor with no gross or microscopic invasion
II	Macroscopic invasion into the mediastinal fat or pleura or microscopic invasion into the capsule
III	Invasion of the pericardium, great vessels, or lung
IVA	Pleural or pericardial dissemination
IVB	Lymphogenous or hematogenous metastasis