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  • Title: Right-to-left shunting via persistent left superior vena cava identified by perfusion lung scintigraphy.
    Author: Rosenbaum RC, Reiner BI, Bidwell JK, Johnston GS.
    Journal: J Nucl Med; 1989 Mar; 30(3):412-4. PubMed ID: 2738670.
    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.
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