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MR Lymphangiography in Pediatrics: Indications, Technique, Findings, and Management
Sheena Pimpalwar1, Tarique Hussain2, Surendranath R Veeram Reddy2
1Section of Pediatric Interventional Radiology, Department of Radiology, Children's Medical Center, UT Southwestern Medical Center, Dallas, Texas.
Insights
Magnetic resonance imaging (MRI) is crucial for pediatric lymphatic imaging, but standard sequences struggle with small vessels. Dynamic contrast-enhanced magnetic resonance lymphangiography offers detailed lymphatic flow assessment for targeted interventions.
Area of Science:
- Pediatric Radiology
- Lymphatic Imaging
- Medical Imaging Techniques
Background:
- Magnetic resonance imaging (MRI) is the primary tool for diagnosing pediatric lymphatic disorders.
- Congenital heart disease patients often present with lymphatic dysfunction.
- Current MRI sequences have limitations in visualizing small lymphatics and differentiating fluid-filled structures.
Purpose of the Study:
- To review the role of MRI in pediatric lymphatic imaging.
- To highlight the limitations of conventional MRI sequences.
- To introduce dynamic contrast-enhanced magnetic resonance lymphangiography (DCE-MRL) as an advanced technique.
Main Methods:
- Utilizes heavily T2-weighted and 3D-balanced steady-state free precession MRI sequences.
- Employs dynamic contrast-enhanced magnetic resonance lymphangiography (DCE-MRL) with gadolinium-based contrast agents.
- Involves invasive administration of contrast into lymph nodes, vessels, or interstitial tissue.
Main Results:
- Standard MRI sequences assess central lymphatic anatomy and fluid distribution but have limited visualization of smaller lymphatics.
- DCE-MRL overcomes these limitations by providing sequential flow information.
- DCE-MRL is critical for evaluating lymphatic flow and identifying intervention targets.
Conclusions:
- While medical and surgical therapies are first-line, DCE-MRL is essential for patients unresponsive to traditional treatments.
- DCE-MRL provides crucial insights into lymphatic disorders not achievable with non-invasive MRI alone.
- This advanced imaging technique guides lymphatic interventions in complex pediatric cases.
Abstract:
Over the past two decades, magnetic resonance imaging (MRI) has become the mainstay for lymphatic imaging in pediatric patients suffering from lymphatic disorders caused by congenital or acquired causes. Pediatric patients, especially those born with complex congenital heart disease, status post single ventricle palliation increasingly constitute the largest group of patients presenting with lymphatic dysfunction. Heavily T2-weighted and 3D-balanced steady-state free precession are complementary MRI sequences used for noninvasive assessment of the central lymphatic anatomy as well as distribution of lymphatic fluid in body cavities, lymphatic cysts, and lymphatic malformations. These sequences are, however, limited in their ability to visualize smaller lymphatics, to differentiate lymphatics from other fluid-filled structures, or to provide sequential flow information. This limitation is overcome by administering a gadolinium-based contrast agent into a lymph node, lymphatic vessel, or interstitial tissue with simultaneous image acquisition, a technique called dynamic contrast-enhanced magnetic resonance lymphangiography. This imaging is invasive but critical for evaluating lymphatic flow and identifying potential targets for lymphatic intervention. Medical therapy, along with traditional transcatheter or surgical approaches to address the underlying cause of the lymphatic disorder, remains the first-line approach, while lymphatic interventions are reserved for patients who have failed these therapies.
