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Magnetic resonance lymphangiography (MRL) effectively visualizes healthy lymphatic vessels in legs. This study establishes baseline MRL imaging for detecting lymphatic abnormalities in non-lymphedematous individuals.

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Area of Science:

  • Medical Imaging
  • Lymphatic System Anatomy
  • Radiology

Background:

  • Limited literature exists on healthy lymphatic vessel appearance via magnetic resonance lymphangiography (MRL).
  • Establishing a baseline is crucial for identifying lymphatic abnormalities.
  • This study focused on MRL imaging in individuals without lymphatic disease.

Purpose of the Study:

  • To characterize the appearance and drainage patterns of healthy lymphatic vessels in the lower limbs using MRL.
  • To establish normative MRL data for comparison with pathological cases.
  • To assess the feasibility of quantitative MRL measurements.

Main Methods:

  • 25 healthy individuals underwent lower limb MRL using a 3.0 T scanner.
  • Optimized gadolinium-based contrast agent (GBCA) concentration was determined.
  • Interdigital forefoot GBCA injections were performed, followed by imaging to assess vessel diameter, tortuosity, and drainage routes.

Main Results:

  • Anteromedial lymphatic pathways were consistently visualized in post-contrast T1-weighted images.
  • Average vessel diameter was 2.47 mm, with an average tortuosity of 1.09.
  • Lymphatic signal peaked approximately 30 minutes post-injection; no vessels were seen on T2-weighted images.

Conclusions:

  • Contrast-enhanced MRL reliably depicts healthy leg lymphatic vessels.
  • Anteromedial drainage is the dominant pathway after interdigital contrast injection.
  • Quantitative MRL measures of vessel size, tortuosity, and drainage rate are obtainable and valuable for detecting lymphatic impairment.