<prompt> Myasthenia gravis may be associated withThymomaSystemic lupus erythematousHypehyroidismAll the above  <response>: Ref Robbins 7e p1344; 9e p1235-1236; Harrison 16e p2521 table 366-3 MYASTHENIA GRAVIS MG is an autoimmune disease characterized by impaired neuromuscular transmission due to circulating antiacetylcholine receptor autoantibodies AchRAb 1. The frequent association of MG with thymic disease, such as follicular hyperplasia and thymoma, suggests that the thymus plays a role in its pathogenesis Patients with MG may have evidence of coexisting autoimmune thyroid diseases AITD 