Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . No CHF , focal consolidation or effusion is detected . However , there is subtle prominence of the interstitial markings in both upper zones , suggesting a subtle interstitial infiltrate bilaterally . No pneumothorax detected . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Suspect subtle interstitial infiltrates in both upper zones . Otherwise , no acute pulmonary process identified . Please see report of chest CT obtained shortly after this radiograph for additional detail .