Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderately low lung volumes with emphysematous changes and flattened hemidiaphragms bilaterally . There is an ill - defined opacity within the left lower lung field most likely within the left lower lobe suspicious for pneumonia . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette is within normal limits . Hila are unremarkable . There is mild multilevel degenerative changes seen in thoracic spine . The pleural surfaces are unremarkable .
    OUTPUT:
    
Left lower lobe pneumonia . Follow up ___ weeks after treatment is recommended .