Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly and widening of the thoracic aorta is unchanged compared to prior examination . Correlation to prior CT chest shows normal - caliber thoracic aorta and this widened appearance is likely due to overlap of the ascending and descending portions . Hilar contours are unremarkable . There is plate - like atelectasis in the left lung base . The lungs are otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic process .