An anterior mediastinal occupancy ct value of 40 may be a mass in the anterior mediastinum on imaging. The mediastinum is located on both sides of the pleural cavity, behind the sternum, in front of the thoracic vertebrae, below the thoracic outlet and above the diaphragm, clinicians will simply divide the mediastinum into the anterior, middle, and posterior zones, the anterior mediastinum contains the thymus gland and lymphatic tissues, the CT findings suggest that anterior mediastinum occupying ct value of 40 may be the presence of tumors in the anterior mediastinum. Thymoma, lymphoma, teratoma, etc. are common in anterior mediastinal space ct value 40. Once discovered, most of them are treated with surgery. If there is some difficulty in diagnosing the tumor present in anterior mediastinum occupying ct value 40, puncture biopsy can be carried out before surgery to clarify the pathology and formulate the corresponding treatment plan. Therefore, patients with CT examination results suggesting anterior mediastinal space-occupying ct value of 40 should go to the hospital as soon as possible to clarify the cause of the disease, and carry out standardized treatment under the guidance of doctors.