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Anomalous inferior vena cava with accessory hemiazygos continuation
Radiology
|April 11, 1976
Insights
A rare congenital anomaly, accessory hemiazygos continuation of the left inferior vena cava, was diagnosed using plain film imaging. Key indicators include a dilated highest intercostal vein and widened paraspinal line.
Area of Science:
- Medical Imaging
- Embryology
- Cardiovascular Anatomy
Background:
- Congenital anomalies of the inferior vena cava (IVC) are uncommon but can have significant clinical implications.
- Anomalous left IVC, where the vessel persists on the left side, is a rare variation.
- Accessory hemiazygos continuation represents a specific pattern of IVC anomaly.
Purpose of the Study:
- To report a case of accessory hemiazygos continuation of an anomalous left inferior vena cava.
- To discuss the embryologic basis of this anomaly.
- To highlight the radiological diagnostic features on plain films.
Main Methods:
- Case report presentation.
- Review of embryologic development of the venous system.
- Analysis of plain film radiographic findings.
Main Results:
- A case demonstrating accessory hemiazygos continuation of the left IVC draining into the left brachiocephalic vein via the highest intercostal vein.
- Radiographic findings included a dilated highest intercostal vein (aortic nipple) and a widened left paraspinal line.
Conclusions:
- Accessory hemiazygos continuation of anomalous left IVC is a rare condition.
- Plain film radiography can suggest this diagnosis through specific signs.
- Understanding embryology and radiological signs is crucial for diagnosis.
Abstract:
A case of accessory hemiazygos continuation of an anomalous left inferior cava with drainage via the highest intercostal vein into the left brachiocephalic vein is reported and the embryologic and radiological significance discussed. The diagnosis is suggested on plain films by the dilated highest intercostal vein, the so-called aortic nipple, and a widened left paraspinal line.