Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were provided . There is a focal opacity in the left lung base with slight obliteration of the left cardiac border concerning for infectious process . There is no other focal consolidation , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal . There are no acute skeletal abnormalities .
    OUTPUT:
    
Left lung base pneumonia .