Thymus gland tumors or thymoma
Some patients with myasthenia gravis might develop a tumor in their thymus gland, a gland that lies under the breastbone and helps in the development of immune cells at an early age. Most of the tumors of thymus gland are not cancerous but they might aggravate the autoimmune disorder by enhancing the production of antibodies to acetylcholine receptors. The doctors typically suggest removing the thymus gland to avoid the progression of myasthenia gravis.