Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . The mediastinal contour is unchanged . There has been interval increase in size of the pleural effusion on the right , now moderate , with associated right basilar opacity likely reflective of compressive atelectasis . Patchy left basilar opacity may also reflect atelectasis . Crowding of bronchovascular structures is demonstrated without overt pulmonary edema . No acute osseous abnormality is detected .
    OUTPUT:
    
Low lung volumes . Increased size of right pleural effusion , now moderate with bibasilar patchy airspace opacities , likely atelectasis .