Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes with increasing bibasilar opacities . Linear opacity radiating from the hilum appears to be atelectatic lung . Probable small left effusion . Mild cardiomegaly . No pulmonary edema .
    OUTPUT:
    
Slight increase in bibasilar opacities with lower lung volumes are favored to be atelectasis .