Which of the following is Not associated with thymoma?

Thymoma is the commenest anterior mediastinal tumor which causes symptoms due to compression on the mediastinal structures. It is associated with the following paraneoplastic syndromes: • Myasthenia gravis (most common) • Acquired hypogammaglobulinemia • Pure red cell aplasia • Graves disease • Pernicious anemia • Dermatomyositis-polymyositis • Cushing syndrome.