title: Lung perfusion scanning. The case of "reverse mismatch".
abstract: A case of paradoxic hyperperfusion or "reverse mismatch" is described in a patient with lobar collapse while on positive pressure mechanical ventilation. The physiology of this finding is explained.
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D011175:Positive-Pressure Respiration; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging* / Q000628:therapy; D011859:Radiography; D011877:Radionuclide Imaging; D014692:Ventilation-Perfusion Ratio; D014980:Xenon Radioisotopes
chemical_list: D014980:Xenon Radioisotopes