Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged , with the heart size appearing mildly enlarged . The aorta is mildly tortuous . The pulmonary vasculature is normal . Known air collection within the right anterior pleural space likely reflective of a pneumothorax is not well seen on the current exam . The remainder of the lungs appear unchanged . There is no large pleural effusion . Contrast from the recent CT is noted within the collecting systems .
    OUTPUT:
    
No interval change from the previous radiograph performed approximately 1 hour earlier .