Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , there is a minimally - present opacification within the posteroinferior aspect of the lingula , which likely represents atelectasis or scarring . No pneumothorax . No pulmonary edema . The right lung is clear . Heart size is top - normal , unchanged . Multilevel degenerative changes of the thoracic spine with findings suggestive of diffuse idiopathic skeletal hyperostosis . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
Minimally - present opacification within the posteroinferior aspect of the lingula likely represents atelectasis or scarring .