This definition appears very rarely
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Partial anomalous pulmonary venous drainage (PAPVD) exists when one or more of the pulmonary veins drain to the left atrium while the other vein is connected to the right atrium. The result is that some oxygen-rich blood is returned to the right atrium and mixes with venous blood, and is then returned to the lungs instead of flowing out of the heart to the body. The result of this anomaly is that the right side of the heart must work harder.
Partial anomalous pulmonary venous drainage Case contributed by Dr Brendon Friesen.
Ferrari VA, Scott CH, Holland GA, Axel L, Sutton M: Ultrafast three-dimensional contrast-enhanced magnetic resonance angiography and imaging in the diagnosis of partial anomalous pulmonary venous drainage. J Am Coll Cardiol 2001, 37(4):1120-8. PubMed Abstract | Publisher Full Text.
^ Prasad SK, Soukias N, Hornung T, Khan M, Pennell DJ, Gatzoulis MA,et al. Role of magnetic resonance angiography in the diagnosis of major aortopulmonary collateral arteries and partial anomalous pulmonary venous drainage. Circulation 2004;109:207-14.