Anomalies of the inferior vena cava are congenital, meaning present from birth, variations in the large vein returning blood from the lower body to the heart. Most cause no symptoms but are clinically important for surgical planning. An MRI may show an abnormal arrangement of this vein consistent with a congenital variation. Finding an inferior vena cava anomaly is clinically important for surgical planning and understanding unexplained venous thrombosis.
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