Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are unremarkable . There is opacification in the left base . Though this may be atelectasis , pneumonia is not excluded . Possible mild bronchial wall thickening is noted , particularly in the right lower lung field . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Possible left lower lobe pneumonia in the appropriate clinical context .