[Thymomas with a myasthenic syndrome]

Area of Science:

• Thoracic Surgery
• Neurosurgery
• Oncology

Background:

• Generalized myasthenia (Gm) is often associated with thymic abnormalities.
• Thymic tumors (TT) are the most common neoplastic masses in the anterior mediastinum.
• A significant percentage of Gm patients present with organ-specific thymic tumors.

Purpose of the Study:

• To analyze the surgical outcomes for patients with generalized myasthenia and thymic tumors.
• To evaluate the effectiveness of diagnostic methods for thymic tumors.
• To assess the long-term results of thymectomy based on thymoma histology.

Main Methods:

• Retrospective analysis of 2560 Gm patients operated between 1960-1996.
• Diagnostic imaging including CT and MRI for thymic tumor detection.
• Thymectomy performed on 247 patients, with detailed histogenetic classification of thymomas.

Main Results:

• Thymic tumors (organ-specific) were found in 252 of 312 patients with thymic masses.
• CT and MRI demonstrated high sensitivity and specificity for diagnosing thymic tumors.
• Postoperative lethality decreased to zero in recent years (1990-1996).
• Early complications included wound infection (2.5%), pneumonia (1.3%), and myasthenic crisis (1.6%).
• Long-term outcomes were poorer for cortical thymomas compared to medullar and mixed types.

Conclusions:

• Thymectomy is a crucial treatment for Gm patients with thymic tumors.
• Diagnostic accuracy for thymic tumors has improved with advanced imaging techniques.
• Histogenetic classification of thymomas is essential for predicting long-term outcomes after thymectomy.