Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . In addition to tortuosity of the aorta , the heart is again mild to moderately enlarged with a left ventricular configuration . There is similar mild relative elevation of the right hemidiaphragm compared to the left . Trace bilateral pleural effusions are suspected . There is vague but apparently increased opacity in the left upper lobe . Mild interstitial changes at the lung bases and vague right upper lung opacity appear unchanged and suggest chronic scarring or perhaps mild interstitial disease .
    OUTPUT:
    
Patchy left upper lobe opacities , possibly atelectasis or scarring , but developing pneumonia is possible . Follow - up radiographs are suggested in approximately six weeks .