Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were performed . There is no pleural effusion or pneumothorax . Left base opacity is is best appreciated on the frontal view . The mediastinum is unremarkable . The cardiac silhouette is top normal .
    OUTPUT:
    
Possible left lower lobe pneumonia . Follow up after treatment is recommended to evaluate resolution .