Congenital systemic veins anomaly

Congenital systemic veins anomaly (also referred to as congenital anomalies of the systemic venous return) encompasses a group of rare developmental malformations affecting the major veins that return deoxygenated blood to the heart. These anomalies arise during embryonic development when the normal remodeling of the cardinal venous system fails to occur properly. The most commonly recognized forms include persistent left superior vena cava (PLSVC), absence or atresia of the right superior vena cava, anomalous drainage of the inferior vena cava (such as interrupted inferior vena cava with azygos or hemiazygos continuation), and duplication of the inferior vena cava. These conditions primarily affect the cardiovascular system. Many individuals with isolated systemic venous anomalies are asymptomatic, and the condition may be discovered incidentally during imaging studies or during placement of central venous catheters. However, in some cases, these anomalies can be associated with other congenital heart defects, including atrial septal defects, atrioventricular canal defects, or heterotaxy syndromes (abnormalities of left-right body asymmetry). When symptomatic, patients may experience arrhythmias, cyanosis (if there is right-to-left shunting), or complications related to associated cardiac malformations. In the context of heterotaxy, systemic venous anomalies may be part of a more complex clinical picture involving splenic abnormalities and visceral organ malposition. Treatment depends on the specific anomaly and its clinical significance. Isolated anomalies that are hemodynamically insignificant typically require no intervention but are important to document for future surgical or interventional planning. When associated with significant congenital heart disease, surgical correction may be necessary. Awareness of these anomalies is critical during cardiac surgery, pacemaker implantation, and central line placement to avoid complications. Long-term follow-up with a cardiologist is recommended for patients with complex forms or associated cardiac defects.

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