Hemiazygos continuation of a left inferior vena cava: CT appearance

Area of Science:

• Radiology
• Anatomical Variations
• Vascular Imaging

Background:

• The inferior vena cava (IVC) is a major vein that returns deoxygenated blood from the lower and middle body into the right atrium of the heart.
• Variations in IVC formation, including left-sided IVC, can occur during embryonic development.
• Hemiazygos continuation is a rare anomaly where the azygos vein system drains into the heart via the hemiazygos vein.

Observation:

• Computed tomography (CT) provides detailed cross-sectional imaging of the thoracic and abdominal vasculature.
• This study presents the characteristic CT findings of hemiazygos continuation of a left-sided IVC.
• Radiological features include visualization of a dilated hemiazygos vein ascending on the left side of the spine and draining into the superior vena cava or azygos vein.

Findings:

• CT imaging can reliably identify hemiazygos continuation of a left-sided IVC.
• Associated anomalies, such as cardiac defects and renal abnormalities, are frequently observed in patients with this vascular variation.
• Accurate radiological diagnosis is crucial for understanding the clinical significance and potential complications.

Implications:

• Recognition of this anomaly on CT is important for surgical planning and patient management.
• Understanding associated anomalies aids in comprehensive patient evaluation and risk assessment.
• This case highlights the importance of recognizing rare vascular variations in routine radiological practice.