Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There has been interval removal of the right upper extremity PICC line . There is a small left pleural effusion with residual opacity in the left lower lobe , which could represent atelectasis or possibly pneumonia . The cardiomediastinal silhouette is stable . No pneumothorax . Bony structures are intact .
    OUTPUT:
    
Small left pleural effusion with residual mild left lower lobe opacity , which is improved from prior exam , though could represent residual atelectasis or pneumonia .