Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval improvement in the left mid lung opacity . There is an ill - defined opacity of the left lower lobe that is new since chest radiograph taken on ___ , but corresponds with left lower lobe nodule noted on recent CT chest . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unchanged .
    OUTPUT:
    
Interval improvement of left mid lung opacity . Left lower lobe ill - defined opacity could be a metastatic disease given patient 's history of breast cancer or a pneumonia given progression since chest radiograph from 1 month prior . Can consider either follow - up in 2 months or repeat chest CT to further characterize the opacity or biopsy for definite diagnosis .