Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low - normal . There is no focal consolidation , effusion , or pneumothorax . There is no central vascular congestion or overt pulmonary edema . Mediastinal and hilar contours are normal . Mild cardiomegaly is unchanged .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Unchanged mild cardiomegaly .