Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable single frontal chest radiograph was obtained . The patient has been extubated . The NG tube remains in the body of the stomach . An area of increased opacity projects over the right lower lung zone . The heart remains moderately enlarged with mild pulmonary vascular congestion . A left pleural effusion persists . There is no pneumothorax .
    OUTPUT:
    
1 . Increased opacity in right lower lung zone may reflect atelectasis or aspiration . 2 . Persistent moderate cardiomegaly with mild pulmonary vascular congestion and small left pleural effusion .