Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again markedly enlarged . Fullness of the left hilum suggests mild vascular congestion . There is increased opacification at the base of the left chest suggesting a combination of possible pleural effusion and parenchymal opacification . There is no pneumothorax .
    OUTPUT:
    
Cardiomegaly and mild vascular congestion . Increased left basilar opacification including suspicion for pleural effusion . Differential considerations include atelectasis but pneumonia is not excluded .