Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe cardiomegaly appears slightly increased compared to the previous exam . Mediastinal and hilar contours are unchanged . The pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is seen . There are mild degenerative changes within the thoracic spine .
    OUTPUT:
    
Moderate to severe cardiomegaly , slightly increased compared to previous exam . No pulmonary edema or radiographic evidence for pneumonia .