Thymomas often progress without noticeable symptoms and are frequently discovered incidentally during diagnostic examinations for other conditions. Unless significantly enlarged, a thymoma may not be visible on standard chest X-rays. Diagnosis typically involves identifying changes in the size or shape of the thymus gland on imaging studies such as CT, MRI, or PET/CT (often performed for other reasons), followed by a biopsy. Biopsy samples can be obtained through fine-needle aspiration biopsy (FNAB), mediastinotomy, or video-assisted thoracoscopic surgery (VATS). Due to the relatively lower diagnostic accuracy of FNAB, VATS is the most commonly employed method for obtaining a definitive diagnosis.