Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity at the right lung base seen on the frontal view , which is not confirmed on the lateral view and is similar to prior radiograph in ___ . There is no pleural effusion or pneumothorax . There is borderline cardiomegaly , stable from prior .
    OUTPUT:
    
Possible opacity at the right lung base seen only on one view is similar in appearance to previous radiograph in ___ , however in the appropriate clinical setting , pneumonia could be considered .