Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Retrocardiac opacification is evident both on frontal and lateral radiographs , concerning for pneumonia . Cardiomediastinal and hilar contours are unremarkable . No overt pulmonary edema identified . No pleural effusion or pneumothorax present . No osseous abnormalities identified .
    OUTPUT:
    
Left lower lobe pneumonia . ___ communicated these findings to Dr . ___ at 14 :00 on ___ via telephone at time of discovery .