Objectives: To examine myasthenia gravis (MG) severity and long-term prognosis in seronegative, seropositive, and thymoma MG.
Materials And Methods: Four series of patients were studied retrospectively. Severity and treatment were assessed each year, and muscle antibodies were assayed.
Results: Seropositive MG patients had a more severe course than seronegative MG patients. MG severity was higher in non-thymectomized compared to thymectomized early-onset MG patients. MG severity did not differ between thymectomized and non-thymectomized late-onset patients. There was no significant difference in MG severity between thymoma and non-thymoma MG patients.
Conclusions: MG is more severe in seropositive MG patients. With proper treatment, especially early thymectomy, the long-term prognosis is good in seropositive MG patients. The present studies indicate a benefit of thymectomy in early-onset MG, but no dramatic benefit in late-onset MG. Similar MG severity and outcome was seen in thymoma and non-thymoma MG.
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