Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . There is a left lower lobe retrocardiac opacity which could represent pneumonia in the appropriate clinical setting . There is also an adjacent linear area of opacification in the left lung base and linear opacities in the right lung base likely representing atelectasis . The previously seen spinal stimulator is unchanged in position since the prior study . There is no evidence of pleural effusion , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Left lower lobe retrocardiac opacity could represent pneumonia in the appropriate clinical setting . Bibasilar linear atelectasis is also present . The above findings were communicated to Dr . ___ , covered by Dr . ___ , by Dr . ___ ___ page at 12 :03 , 5 minutes after the finding was discovered .