Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a increased airspace opacity in the left lower lobe , likely due to localized atelectasis . However , in the appropriate clinical setting , pneumonia can not be ruled out . Mild pulmonary venous congestion is grossly stable . No pneumothorax . The cardiomediastinal silhouette is unchanged . The calcified right breast implant is unchanged .
    OUTPUT:
    
1 . Left lower lobe opacification likely worsening atelectasis , but in the appropriate clinical setting pneumonia can not be ruled out . 2 . Stable pulmonary venous congestion .