Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung apex is obscured by the patient 's chin , which is flexed and accordingly situated over the region . There is mild relative elevation of the right hemidiaphragm . The heart is mildly enlarged . The aorta is moderately tortuous . Patchy basilar opacities are most suggestive of atelectasis . Otherwise , the lungs appear clear . There is no definite pleural effusion . No pneumothorax is visualized .
    OUTPUT:
    
Patchy basilar opacities , most suggestive of atelectasis although pneumonia is difficult to exclude .