Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . The mediastinal silhouette and pulmonary vasculature are unremarkable . Along the left heart border is an opacity , which in the appropriate clinical context could represent a pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Possible left pneumonia in the appropriate clinical context .