Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity in the right lower lobe , in the location of prior pneumonia noted on ___ . It s margins are slightly irregular . This likely represents residual airspace consolidation , but follow up to resolution is advised to exclude an underlying malignancy . Remainder of the lungs are clear . No pleural effusion or pneumothorax . Cardiomediastinal contours are normal . Calcifications are noted in the aortic arch . No acute osseous abnormalities .
    OUTPUT:
    
Residual right lower lobe airspace consolidation likely represents resolving pneumonia , substantially improved compared to ___ . However , short interval follow - up is advised to exclude an underlying malignancy .