Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac silhouette is borderline enlarged ; pericardial effusion is not excluded . There is no pleural effusion or pneumothorax . A vague right infrahilar opacity is seen , which appears grossly similar to comparison . This may represent vascular crowding given decreased lung volumes . No definite focal consolidation is identified .
    OUTPUT:
    
1 . No definite acute intrathoracic abnormality . 2 . The cardiac silhouette is mildly enlarged , more pronounced than on prior examination . This may be exaggerated due to low lung volumes , however , cardiomegaly and / or pericardial effusion are not excluded .