Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is clear without consolidation . The previously seen equivocal opacity was likely from superimposed normal vessels in the setting of low lung volumes . The left hilum remains mildly prominent due to patient 's known tumor , but is much improved from the previous chest radiograph on ___ . There is no pleural effusion or pneumothorax . The size of the cardiac silhouette is at the upper limits of normal and unchanged .
    OUTPUT:
    
No evidence of pneumonia .