A corner is turned.
D006801:Humans; D007726:Krypton; D008168:Lung / Q000000981:diagnostic imaging / Q000473:pathology; D011656:Pulmonary Emphysema / Q000000981:diagnostic imaging*; D011859:Radiography; D011868:Radioisotopes
D011868:Radioisotopes; D007726:Krypton