Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . The mediastinal and hilar contours are unremarkable with mild calcification of the aortic knob noted . Apart from linear atelectasis or scarring in the left upper lobe , the lungs are clear without focal consolidation . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .