Left pulmonary artery sling--anatomy and imaging

Area of Science:

• Cardiovascular and Thoracic Surgery
• Pediatric Radiology
• Congenital Pulmonary Malformations

Background:

• A pulmonary sling is a rare congenital anomaly where the left pulmonary artery arises abnormally from the right pulmonary artery.
• This aberrant vessel courses around the airway, potentially compressing it and leading to respiratory distress.
• Two distinct types of pulmonary sling exist, each with unique associated pathologies and management strategies.

Purpose of the Study:

• To delineate the distinct imaging findings of the two types of pulmonary sling.
• To emphasize the importance of recognizing these types for appropriate clinical management.
• To highlight associated abnormalities that require consideration in therapeutic decisions.

Main Methods:

• Review of imaging findings in patients diagnosed with pulmonary sling.
• Classification of pulmonary sling into Type I and Type II based on anatomical characteristics and associated airway abnormalities.
• Correlation of imaging findings with clinical presentation and management outcomes.

Main Results:

• Type I pulmonary sling is less complex, associated with tracheobronchomalacia, and often managed with left pulmonary artery (LPA) reimplantation.
• Type II pulmonary sling is more common and complex, strongly associated with long-segment tracheal stenosis.
• Both types, particularly Type II, can be associated with cardiovascular, pulmonary, and other anomalies requiring integrated management.

Conclusions:

• Accurate imaging identification and characterization of pulmonary sling types are crucial for effective management.
• Management strategies must address both the aberrant LPA and associated airway abnormalities, especially tracheal stenosis in Type II.
• Advances in surgical techniques are improving outcomes for complex airway stenosis associated with pulmonary sling.