Myasthenia gravis. Often thymomas present as a result of an associate disease call myasthenia gravis (mg). Mg is classically diagnosed with symptoms that begin with ocular weakness leading to blurry vision. This can progress to "bulbar" symptoms which involve your ability to swallow and further more it can lead to generalize body muscle weakness. These symptoms can be a tip off that a pt may indeed also have a thymoma.