Frequency of myasthenia gravis and Masaoka–Koga stages according to histological types of thymomas in a series of 239 cases encountered in a 10-year period (2010–2019) at Marie Lannelongue Hospital (Le Plessis Robinson, France)
| Cases | Myasthenia gravis | Masaoka–Koga | ||
| I/II | III/IV | |||
| A | 24 (10) | 1 (4.2) | 18 (75) | 6 (25) |
| AB | 62 (25.9) | 7 (11) | 52 (83.9) | 10 (16.1) |
| Micronodular | 5 (2.09) | 0 (0) | 4 (80) | 1 (20) |
| B1 | 36 (15.1) | 15 (42) | 20 (58.8) | 14 (41.2) |
| B2 | 69 (28.9) | 37 (54) | 40 (59.7) | 27 (40.3) |
| B3 | 40 (16.7) | 22 (55) | 10 (25.6) | 29 (74.4) |
| Unclassified | 3 (1.26) | 1 (33) | 1 (100) | 0 (0) |
| Total | 239 (100) | 83 (35) | 145 (62.5) | 87 (37.5) |
Data are presented as n (%). Bold type represents significant features.