Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . This accentuates the size of the cardiac silhouette which appears mildly enlarged . A coronary artery stent is re- demonstrated . Mediastinal and hilar contours are grossly unremarkable . There is crowding of bronchovascular structures without overt pulmonary edema . Linear and patchy bibasilar airspace opacities likely reflect atelectasis in the setting of low lung volumes . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy and linear bibasilar airspace opacities most likely reflect atelectasis in the setting of low lung volumes . Infection , however , is not completely excluded , and consider repeat examination with improved inspiratory effort for further assessment .