superior vena cava persistent left

superior vena cava persistent left
a developmental anomaly in which the left superior vena cava persists into postnatal life, usually draining into the left atrium; it is due to failure of the upper part of the left anterior cardinal vein to become obliterated. It may be an isolated anomaly or accompany other cardiovascular defects, such as tetralogy of Fallot.

Medical dictionary. 2011.

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