Myasthenia gravis-associated antibodies in asymptomatic thymoma.

Serum antibodies associated with myasthenia gravis were evaluated before and after therapy in an asymptomatic patient having a malignant thymoma. The case illustrates that myasthenia-associated antibodies may also be useful as a tumor marker of thymoma in the work-up of mediastinal masses, in evaluating therapy of thymoma, and possibly in detecting recurrence of thymoma and potential for developing myasthenia gravis.