Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal cardiomediastinal and hilar contours . Opacity at the right base consistent with blood or fluid in the pleural space with atelectasis and a possible pulmonary contusion . No appreciable pneumothorax . No osseous or soft tissue abnormalities .
    OUTPUT:
    
Stable opacity at the right base consistent with pleural effusion or hemothorax . No appreciable pneumothorax .