title: Radiology case of the month.
mesh_terms: D005260:Female; D006801:Humans; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging*; D011859:Radiography; D011868:Radioisotopes; D011877:Radionuclide Imaging; D014692:Ventilation-Perfusion Ratio; D014978:Xenon
chemical_list: D011868:Radioisotopes; D014978:Xenon