Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low which leads to bronchovascular crowding . A subtle retrocardiac opacity is present . Pulmonary vascular congestion is mild . The cardiac silhouette is mildly enlarged . There is no pleural effusion or pneumothorax . Included upper abdomen is unremarkable .
    OUTPUT:
    
1 . Retrocardiac opacity may be due to atelectasis however a developing pneumonia can not be excluded in the appropriate clinical setting . 2 . Mild pulmonary vascular congestion and cardiomegaly .