Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates minimal streaky opacity projecting over the lower thoracic spine , likely corresponding to opacity seen in a retrocardiac distribution . The lungs are otherwise clear without pleural effusion or pneumothorax . The cardiac silhouette is normal in size , the mediastinal contours are normal .
    OUTPUT:
    
Possible left lower lobe pneumonia .