Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear besides linear opacity on the lateral view projecting over the heart , potentially in the middle lobe most suggestive of atelectasis . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process , no focal consolidation . .