Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable mild to moderate cardiomegaly . Cardiomediastinal and hilar contours are also stable . Extensive interstitial abnormality , with basal predominance is most likely moderate to severe pulmonary edema , and could obscure a predisposing interstitial pneumonia . No pneumothorax . There is a small right pleural effusion and likely trace left pleural effusion .
    OUTPUT:
    
Chronic mild to moderate cardiomegaly . Recurrent , moderately severe pulmonary edema . Suggest radiographic followup treatment of heart failure , to detect any concurrent pneumonia . Incidental note is made of large cervical ribs , sometimes a cause of neurovascular impingement .