Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are normal . Linear opacity is seen at the bilateral bases , most consistent with atelectasis . Subtle opacity is seen at the left lung base , which , in the appropriate clinical context , could represent pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Possible left lower lobe pneumonia in the appropriate clinical context .