Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . There is crowding of bronchovascular structures without overt pulmonary edema . Patchy opacities in the lung bases are compatible with areas of subsegmental atelectasis . Previously noted tiny left pneumothorax is not clearly visualized on the current radiograph . Minimal left pleural effusion is re - demonstrated . There is residual oral contrast material within the stomach . No acute osseous abnormality is seen .
    OUTPUT:
    
Previously seen noted tiny left pneumothorax is not clearly visualized on the radiograph . Bibasilar atelectasis and trace left pleural effusion .