Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity in the right lower lung with silhouetting of a portion of the right hemidiaphragm , right shift of the heart , and probable elevation of the right hemidiaphragm is most compatible with atelectasis , new from the prior exam . The remaining right lung and left lung are essentially clear . No edema or large pleural effusion . No pneumothorax . The heart size is normal . The mediastinum is not widened . No acute osseous abnormality . Incompletely imaged coarse calcifications projecting over the right upper abdomen are consistent with sequelae of prior granulomatous disease , imaged more completely on the recent CT abdomen and pelvis .
    OUTPUT:
    
Interval development of right lower lobe atelectasis , likely from aspiration and mucoid impaction of the airway when compared with prior imaging .