Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . Linear opacity within the left lung base likely reflects atelectasis . Elevation of the left hemidiaphragm is chronic . Right lung is clear . Previously noted ill - defined hazy opacity in the medial right apex appears improved . No pleural effusion or pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
Left basilar atelectasis . Previously described hazy opacity within the medial right apex appears improved . Chronic elevation of the left hemidiaphragm .