The author of this personal essay describes how, at age nineteen, she was diagnosed with multiple sclerosis. Four years later, the unthinkable happened. After losing her ability to walk, she was informed by her doctor that she was one of only 350 out of 110,000 people currently taking Tysabri worldwide who had developed a condition called Progressive Multifocal Leukoencephalopathy (PML), a brain infection. Her cerebellum was slowly being eaten alive. Of those 350 people, only 15 percent had survived. In other words, her chances were slim. This essay is the story of her battle with PML and the impressive lessons she has learned along this incredibly difficult path.