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Quantitative evaluation of primary lower extremity lymphedema staging using MRI: a preliminary study
Mengke Liu1, Bin Li2, Kun Hao3
1Department of Radiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China.
Quantitative Imaging in Medicine and Surgery
|August 15, 2023
Summary
Magnetic resonance imaging (MRI) measurements of lower extremity lymphedema (LEL) soft tissue areas can aid in clinical staging. The difference in subcutaneous limb area is a specific indicator for distinguishing between LEL stages I and II.
Area of Science:
- Radiology
- Medical Imaging
- Lymphedema Research
Background:
- Lower extremity lymphedema (LEL) staging is clinically challenging.
- Magnetic resonance imaging (MRI) offers high-resolution soft tissue assessment for LEL.
- This study evaluates MRI-based soft tissue area measurements for LEL staging.
Purpose of the Study:
- To assess the utility of MRI-derived soft tissue area measurements in staging primary LEL.
- To determine if quantitative MRI parameters correlate with clinical LEL stages.
- To identify specific MRI metrics for differentiating LEL stages.
Main Methods:
- Retrospective analysis of 90 primary LEL patients.
- MRI (STIR sequence) to measure calf soft tissue areas (total, muscle, bone, subcutaneous).
- Calculation of limb subcutaneous area difference, S/B, and S/M ratios; classification using ISL staging.
Main Results:
- Significant differences in total, subcutaneous, limb difference, S/B, and S/M between stages I/II and I/III (P<0.001).
- Positive correlations found between clinical stage and limb subcutaneous difference, S/B, S/M, and subcutaneous area.
- Receiver operating characteristic (ROC) analysis showed best discrimination for limb subcutaneous difference (AUC=0.950), followed by S/B (AUC=0.930) and S/M (AUC=0.895).
Conclusions:
- MRI soft tissue area measurements can serve as an auxiliary method for primary LEL staging.
- The difference in limb subcutaneous area is a specific indicator for distinguishing clinical stage I from stage II LEL.
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