POMC and myasthenia gravis: Many other preoperative factors may be related to POMC, such as pulmonary function, immune suppressants, thymoma, and MG duration.19 Studies including only thymoma patients with MG indicated that WHO classification (B2 + B3) and not‐R0 resection may also be independent risk factors for POMC.20, 21 A total of 20 patients (10.3%) developed POMC in this study, and one died of ventilator‐associated pneumonia in the second month after surgery.