Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Since the prior study , there is a new retrocardiac opacity projecting over the left lower lobe posteriorly . The right lung is grossly clear . There is no evidence of pulmonary edema , pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Opacity in the left lower lobe posteriorly would be consistent with pneumonia in the appropriate clinical setting . Recommend repeat radiographs after successful treatment . The above findings were communicated to Dr . ___ by Dr . ___ ___ telephone at 17 :08 , five minutes after the finding was discovered .