Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Crowding of bronchovascular structures is present , although the pulmonary vasculature is not engorged . Patchy and streaky opacities in the lung bases likely reflect areas of atelectasis . Trace left pleural effusion seen on recent CT is not well assessed on this current exam . There is no pneumothorax . No subdiaphragmatic free air is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Small left pleural effusion seen on preceding CT is not well assessed on the current exam . No subdiaphragmatic free air .