Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette is borderline enlarged . The mediastinal silhouette and pulmonary vasculature are unremarkable . No definite consolidation , pneumothorax or pleural effusion is identified . Bibasilar linear densities are most compatible with atelectasis though a component of aspiration can not be excluded .
    OUTPUT:
    
No definite acute intrathoracic process .