Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest demonstrate well - expanded lungs . Left lower lobe opacity again seen , which is essentially unchanged from previous imaging . Slight improvement of atelectasis at the left base is seen . There are no pleural effusions or pneumothorax . Cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Persistent left lower lobe opacity suspicious for malignancy . Improving left base atelectasis .