Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mild to moderately enlarged . The aorta is tortuous . Widening of the superior mediastinum is likely due to supine positioning and low lung volumes . While there is mild crowding of the bronchovascular structures , no overt pulmonary edema is present . Patchy atelectasis is seen in the lung bases without focal consolidation . No large pleural effusion or pneumothorax is identified on this supine exam . No acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes . Mild to moderate cardiomegaly . Patchy atelectasis in the lung bases .