Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is ill - defined opacification involving the right lower lobe , which would be compatible with pneumonia . Given the lack of comparison studies ; however , it is impossible to determine whether this represents radiologic lag of a prior consolidation , a new consolidation or recurrence . The remaining lungs are clear . The mediastinum is unremarkable . The cardiac silhouette is within normal limits for size . No definite effusion or pneumothorax is noted . The osseous structures are unremarkable .
    OUTPUT:
    
There is ill - defined opacity in the right lower lobe . The chronicity is unknown . The prior pneumonia has not been specified as to location and as such is impossible to determine whether this represents radiologic lag of a previously diagnosed pneumonia , recurrent pneumonia , or possibly a chronic airspace process in which case a more detailed evaluation should be performed . Correlate clinically . If prior studies can not be obtained , to aid in the comparison , CT scan may be advised .