Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe cardiomegaly and the mediastinal contours are unchanged . Compared to the prior chest radiograph of ___ mild interstitial pulmonary edema has resolved . No focal opacity , pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic process . Specifically , no pneumothorax .