Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is moderate interstitial abnormality , probably unchanged , suggesting known interstitial abnormality but perhaps with coinciding pulmonary edema . However , there is no focal opacification . Fissures appear mildly thickened . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Stable interstitial abnormality suggesting combination of interstitial edema and underlying known interstitial lung disease .