Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and hilar contours are normal . Right paratracheal mediastinal bulge compatible with known mediastinal cyst is unchanged . The pulmonary vasculature is normal and the lungs are clear . There is no pleural effusion or pneumothorax . No acute osseous abnormalities are detected . Mild degenerative changes are noted within the thoracic spine . Partially imaged is hardware within the left humerus .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Unchanged right paratracheal mediastinal bulge compatible with known mediastinal cyst .