Significance of the site of injection in unexpected right-to-left shunting.
Lung perfusion scintigraphy, with Tc-99m MAA injected into a left antecubital vein, revealed extensive uptake in the myocardium, kidneys, spleen, thyroid, and brain. After a right antecubital injection, a normal pulmonary perfusion pattern was found. This finding is specific for right-to-left shunting due to anomalous systemic venous drainage into the left atrium.
D000328:Adult; D001165:Arteriovenous Malformations / Q000000981:diagnostic imaging*; D004550:Elbow / Q000098:blood supply; D006325:Heart Atria / Q000000981:diagnostic imaging; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography; D011877:Radionuclide Imaging; D013382:Subtraction Technique; D013668:Technetium Tc 99m Aggregated Albumin; D014680:Veins; D014682:Vena Cava, Inferior / Q000002:abnormalities / Q000000981:diagnostic imaging*; D014683:Vena Cava, Superior / Q000002:abnormalities / Q000000981:diagnostic imaging*
D013668:Technetium Tc 99m Aggregated Albumin