Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previous questionable opacity within the medial left lung base appears to have resolved . Lung volumes remain low , though no consolidation is identified to suggest pneumonia . There is no vascular congestion or interstitial edema . Cardiomediastinal and hilar contours are within normal limits and are unchanged from prior . Incidental note is made of an azygos lobe . There is no pneumothorax or pneumomediastinum .
    OUTPUT:
    
No radiographic evidence of pneumonia