Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size appears borderline enlarged . The aorta is tortuous . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is present . Minimal atelectasis is noted at the left lung base . There is mild elevation of the left hemidiaphragm of unknown chronicity . No acute osseous abnormality is visualized .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild elevation of the left hemidiaphragm of unknown chronicity with mild left basilar atelectasis .