Thymoma
Chapter: 12
A mediastinal tumor, most frequently occurring in the anterior mediastinum, with a peak incidence in the 5th decade of life. Associated diseases include myasthenia gravis, red cell hypoplasia and hypogamaglobulinemia. Most thymomas are slow growing with a relatively benign clinical behavior. The main factor that adversely affects the prognosis is evidence of invasion of surrounding structures, a feature which may be noted at the time of surgical resection.