Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lobe opacity is worrisome for pneumonia . There is also concern for small left pleural effusion , possibly trace on the right . The cardiac silhouette is enlarged which could be due to underlying cardiomyopathy or pericardial effusion . The aortic knob is calcified . No pneumothorax is seen . There may be minimal vascular congestion .
    OUTPUT:
    
Left base opacity worrisome for pneumonia and small pleural effusion . Enlarged cardiac silhouette , can be seen with cardiomyopathy or pericardial effusion . Possible mild vascular congestion .