title: Pulmonary ventilation/perfusion and reverse mismatches in an infant.
abstract: A male infant, with bronchopulmonary dysplasia and ventilator dependence, had lung ventilation (Xe-133 gas) and perfusion (Tc-99m MAA) imaging performed. The examination revealed a region that was ventilated but not perfused (mismatch) and a separate area that was perfused but not ventilated (reverse mismatch). The basis of both abnormalities is suspected to be related to bronchopulmonary dysplasia, atelectasis and/or mechanical ventilation. Ventilation/perfusion mismatches and reverse mismatches can occur in the same patient.
mesh_terms: D001997:Bronchopulmonary Dysplasia / Q000503:physiopathology*; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D011652:Pulmonary Circulation; D011877:Radionuclide Imaging; D012119:Respiration