Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is at the upper limits of normal . The mediastinal and hilar contours are within normal limits . The lungs are clear of consolidation , although they exhibit low lung volumes which exaggerates the vascular and parenchymal markings . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes but no evidence of pneumonia .