case_images: PMC11802489_01
case_images: Radiological findings in thymus-enhanced CT scan. (A) a mass-like soft tissue density shadow is observed in the left upper anterior mediastinum. (B) shows homogeneous enhancement of the soft tissue in the upper anterior mediastinum, with smooth borders and no invasion of surrounding major blood vessels or the heart.
case_images: fimmu-16-1498847-g001.jpg
case_images: PMC11802489_01_fimmu-16-1498847-g001.jpg
case_images: f1
case_images: An enhanced CT scan of the thymus showed a mass-like soft tissue density in the left upper anterior mediastinum, measuring approximately 37mmx18mm, with clear borders, suggesting a possible thymoma ( Figure 1 ).
case_images: Illustration of improvement in upper limb weakness following immunotherapy and thymoma resection. Upon admission, the patient presented weakness in raising the left upper limb (A) and difficulty extending the fingers of the right hand, particularly the third and fourth fingers (B). Following adequate immunotherapy and thymoma resection, muscle strength in the left upper limb (C) and finger extension in the right hand (D) significantly improved.
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case_images: PMC11802489_01_fimmu-16-1498847-g002.jpg
case_images: f2
case_images: According to the diagnosis criteria of International Consensus Guidance for Management, the final diagnosis was MG with Myasthenia Gravis Foundation of America (MGFA) Type IIa ( Figure 2A ). Postoperatively, the patient continued to take oral prednisolone at a dose of 20 mg once daily ( Figures 2B, C ). At the 2-month follow-up, the patient's symptoms had completely resolved (MRC 5) ( Table 2 ,  Figure 2D ).