The vascular vise causing TAPVR type I to radiographically mimic TAPVR type III

Area of Science:

• Cardiology
• Pediatric Cardiology
• Thoracic Surgery

Background:

• Total anomalous pulmonary venous return (TAPVR) is a congenital heart defect where pulmonary veins do not connect normally to the left atrium.
• Supracardiac TAPVR involves the anomalous veins draining into a systemic vein or its tributaries above the diaphragm.
• The infradiaphragmatic type of TAPVR involves drainage below the diaphragm.

Observation:

• A specific subtype of supracardiac TAPVR features a vertical vein positioned between the left pulmonary artery and the left mainstem bronchus.
• This anatomical arrangement creates a "vascular vise," leading to obstruction of pulmonary venous return.
• This anatomical variant can present a diagnostic challenge.

Findings:

• The "vascular vise" phenomenon in supracardiac TAPVR can lead to radiographic findings that mimic infradiaphragmatic TAPVR (Type III).
• Accurate differentiation is crucial for appropriate surgical planning and management.
• This highlights the importance of detailed anatomical assessment in TAPVR diagnosis.

Implications:

• Understanding the "vascular vise" is critical for accurate diagnosis and surgical intervention in TAPVR.
• Misdiagnosis can lead to delayed or incorrect treatment, impacting patient outcomes.
• Further research into imaging characteristics can improve diagnostic accuracy for this TAPVR subtype.