Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ovoid density projecting over the left perihilar region at the eighth , may represent an orthogonal imaged vessel and is stable from the prior study over ___ years ago . There is no evidence of suspicious opacities , there is no pleural effusion or pneumothorax . The cardiomediastinal silhouette and hila are normal .
    OUTPUT:
    
No acute cardiothoracic process including no evidence of pneumonia .