<prompt> All of the following may be associated with Thymoma, Except:SIADHMyaesthenia GravisHypogammaglobulinemiaCushings syndrome  <response>: Answer is A SIADH: Syndrome of Inappropriate ADH secretion SIADH has not been mentioned in association with Thymomas. Clinical Syndromes Associated with Thymomas Paraneoplastic Immunologic Syndromes associated with both benign and malignant thymomas occur frequently, do not affect prognosis and may not reverse following thymectomy. Charachteristic Syndromes Myaesthenia Gravis most commonQ Acquired Hypogammaglobulinemia 10Q Pure Red Cell AplasiacQ Rare Syndromes Associated Diseases Ectopic Cushings Syndrome Autoimmune Thyroiditis Graves Disease Connective Tissue Disorders Vasculitis - Polymyositis Dermatamyositis - Granulomatous myocarditis - SLE - Rheumatoid Ahritis - Sjogrens syndrome, Scleroderma Churg - Strauss syndrome, Microscopic polyangitis, Isolated Pauci - immune crescenteric glomenulonephritis Optic neuritis Limbic encephalitis Hyperophic Osteoahropathy Pernicious anemia Pemphigus Panhypopituarism Ulcerative colitis Addisons disease 