Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is a persistent diffuse mild interstitial abnormality . This appearance suggests mild vascular pulmonary edema but is less striking than on the prior radiographs . In addition a lingular opacity is seen in two views but better depicted on the frontal view . There is no definite pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Focal opacity in the lingula . This could be seen with pneumonia but is also a common site for atelectasis . Correlation with clinical presentation and consideration of short - term follow - up radiographs is suggested . 2 . Findings suggesting mild pulmonary edema .