Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal contour is unremarkable . Lung volumes are low which causes crowding of the bronchovascular structures . No overt pulmonary edema is demonstrated . Streaky opacities in the lung bases likely reflect atelectasis . Elevation of the right hemidiaphragm is re - demonstrated . There is no pneumothorax . No large pleural effusion is identified although the left costophrenic angle is excluded from the field of view as the patient could not cooperate with positioning instructions .
    OUTPUT:
    
Bibasilar atelectasis . Low lung volumes . Exclusion of the left costophrenic angle .