<prompt> Thymoma may be associated with all the conditions, EXCEPT:PolymyositisSjogrens syndromeUlcerative colitisCrohns disease  <response>: Patients with myasthenia gravis-10-15 have thymoma. Thymoma may be associated with polymyositis, systemic lupus erythematosus, thyroiditis, Sjogrens syndrome, ulcerative colitis, pernicious anemia, Addisons disease, scleroderma, and panhypopituitarism. Ref: Harrison, E-18, Chapter e-20 