Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar atelectasis and lung volume loss is seen both on the PA and lateral radiographs . Right lung basilar atelectasis is seen with right pleural effusion . Left lower lung volume loss is seen with triangular opacity overlying the posterior left lung base . This opacity may represent pneumonia versus chronic infectious change . No pulmonary edema is noted , and the cardiac silhouette and mediastinal contours are within normal limits .
    OUTPUT:
    
There is bibasalir lung volume loss . The right - side has an associated pleural effusion . The left lung base has a posterior triangular opacity which may represent a pneumonia versus chronic infectious change .