Thymoma is a type of tumor that originates in the thymus, a small organ located in the chest that plays a crucial role in the immune system. This tumor is usually slow-growing and can be benign (non-cancerous) or malignant (cancerous). Thymomas are often associated with autoimmune diseases, such as myasthenia gravis, which can affect muscle strength. Diagnosis of thymoma typically involves imaging tests like CT scans and MRI, along with a biopsy to confirm the presence of cancer cells. Treatment options may include surgery to remove the tumor, radiation therapy, and chemotherapy, depending on the tumor's size and stage.