Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The view is lordotic . The heart is at the upper limits of normal size . The aorta is moderately tortuous . The mediastinal and hilar contours appear unremarkable . There is a patchy opacity in the right costophrenic sulcus , probably atelectasis , although it is difficult to exclude a small pleural effusion . No definite pleural effusion is seen , however . There is no pneumothorax .
    OUTPUT:
    
No definite acute disease .