An unusual aberrant left subclavian artery

Area of Science:

• Cardiovascular embryology
• Congenital heart disease
• Pediatric cardiology

Background:

• Tetralogy of Fallot is a complex congenital heart defect.
• Pulmonary atresia involves the absence of the pulmonary valve opening.
• Right aortic arch is a rare aortic anomaly.

Observation:

• A child presented with Tetralogy of Fallot, pulmonary atresia, and a right aortic arch.
• The left subclavian artery originated from an atypical low position on the aortic arch.
• This aberrant vessel was initially misidentified as a systemic-to-pulmonary collateral artery.

Findings:

• The unusual origin of the left subclavian artery is a significant anatomical finding.
• Embryological development may explain this anomaly, suggesting a developmental "lag" in the left subclavian artery's migration.
• Misinterpretation highlights the diagnostic challenges posed by rare vascular variations.

Implications:

• Accurate identification of aberrant vasculature is crucial for surgical planning in complex congenital heart disease.
• Understanding embryological mechanisms aids in diagnosing and managing similar pediatric cardiovascular anomalies.
• This case underscores the importance of detailed vascular imaging in neonates and infants with complex heart defects.