Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph performed on ___ , there has been interval development of an ill - defined opacity in the left midlung / left lung base suspicious for pneumonia . There is also mild pulmonary vascular congestion . No pleural effusion or pneumothorax . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified .
    OUTPUT:
    
1 . New left mid lung / left lung base opacity , suspicious for pneumonia . 2 . Mild pulmonary vascular congestion .