Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral upright chest radiograph demonstrates clear lungs bilaterally with no focal consolidation concerning for pneumonia . There is no pleural effusion . Prominence of the left hilum thought to reflect a tortuous descending aorta . The right heart border is obscured on the frontal view , which does not correlate to an abnormality on lateral view . This is thought to reflect atelectasis . Diffuse mild interstitial markings is identified with mild bronchial wall thickening within the lower lungs . No acute osseous abnormality is identified .
    OUTPUT:
    
Mild interstitial abnormality with mild bronchial wall inflammation . This may reflect early edema . No focal consolidation convincing for pneumonia is identified .