Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . Superior mediastinal widening is likely related to supine positioning and AP technique . Pulmonary vasculature is not engorged . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified however the extreme left costophrenic angle is excluded from the field of view . No displaced fractures are visualized .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Widening of the superior mediastinum is likely related to supine positioning and AP technique .