Thymectomy in late-onset myasthenia gravis

Area of Science:

• Neurology
• Immunology
• Thoracic Surgery

Background:

• Myasthenia gravis (MG) is an autoimmune disorder affecting neuromuscular junctions.
• Late-onset MG presents diagnostic challenges, particularly when thymoma is not initially detected.
• Standard treatments for MG may not always be sufficient for severe cases.

Observation:

• Two patients with late-onset myasthenia gravis underwent thymectomy via sternal splitting.
• Preoperative imaging (CT scan) did not reveal thymomas in either patient.
• One patient was critically ill, while the other showed partial response to medical therapy.

Findings:

• Post-thymectomy, both patients experienced successful treatment outcomes.
• Histopathological examination revealed thymolipoma in one patient and malignant thymoma in the other.
• The study highlights that not all thymomas are associated with anti-striated muscle antibodies.

Implications:

• Thymectomy should be considered for late-onset myasthenia gravis patients, irrespective of preoperative thymoma detection.
• Mediastinal CT scans have limitations in diagnosing thymoma.
• This approach may offer a viable treatment option for refractory or severe late-onset MG cases.