Which condition is commonly associated with thymoma?

Which condition is commonly associated with thymoma?

• A. Myasthenia gravis
• B. Systemic lupus erythematosus
• C. Rheumatoid arthritis
• D. Scleroderma

Answer: (A)

Thymoma is a tumor of thymic epithelial cells that disrupts normal T-cell education, leading to loss of self-tolerance and autoimmune phenomena. The most common condition associated with thymic tumors is myasthenia gravis, an autoimmune attack on the acetylcholine receptors at the neuromuscular junction that causes fatigable weakness and ptosis. In practice, a significant number of thymoma patients have MG, and MG itself frequently involves thymic abnormalities or removal of the thymus can improve MG symptoms. The other autoimmune diseases listed—systemic lupus erythematosus, rheumatoid arthritis, and scleroderma—do not have as strong or as classic an association with thymoma, making myasthenia gravis the best answer.

Thymoma is a tumor of thymic epithelial cells that disrupts normal T-cell education, leading to loss of self-tolerance and autoimmune phenomena. The most common condition associated with thymic tumors is myasthenia gravis, an autoimmune attack on the acetylcholine receptors at the neuromuscular junction that causes fatigable weakness and ptosis. In practice, a significant number of thymoma patients have MG, and MG itself frequently involves thymic abnormalities or removal of the thymus can improve MG symptoms. The other autoimmune diseases listed—systemic lupus erythematosus, rheumatoid arthritis, and scleroderma—do not have as strong or as classic an association with thymoma, making myasthenia gravis the best answer.