Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mid left lung parenchymal opacity . The right lung parenchyma is unremarkable . There is no pleural effusion or pneumothorax . Heart size is again mildly enlarged . There is heavy calcification of the aortic knob .
    OUTPUT:
    
Asymmetric opacity in the mid left lung , best seen on the frontal view , is concerning for pneumonia . Recommend followup to resolution .