title: Right-to-left shunting via persistent left superior vena cava identified by perfusion lung scintigraphy.
abstract: A right-to-left shunt was demonstrated following a left antecubital injection of [99mTc]MAA but was not seen after a right antecubital injection. This was because of the presence of a persistent left superior vena cava draining into the left atrium. Recognition of the presence of this anatomic variant is of importance in perfusion imaging, in patients with otherwise unexplained systemic embolization.
authors.affiliation: Dept. of Diagnostic Radiology, University of Maryland Medical System, Baltimore 21201.
authors.forename: R C
authors.initials: RC
authors.lastname: Rosenbaum
authors.forename: B I
authors.initials: BI
authors.lastname: Reiner
authors.forename: J K
authors.initials: JK
authors.lastname: Bidwell
authors.forename: G S
authors.initials: GS
authors.lastname: Johnston
mesh_terms: D000328:Adult; D005260:Female; D006343:Heart Septal Defects / Q000000981:diagnostic imaging*; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D013668:Technetium Tc 99m Aggregated Albumin; D014683:Vena Cava, Superior / Q000002:abnormalities*
chemical_list: D013668:Technetium Tc 99m Aggregated Albumin