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Multifrequency Magnetic Resonance Elastography Detects Small Abdominal Lymph Node Metastasis by High Stiffness
Christian Neelsen1, Thomas Elgeti, Tom Meyer
1From the Department of Radiology, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany (C.N., T.E., T.M., B.H., I.S., S.R.M.G.); Division of Radiology, German Cancer Research Center, Heidelberg, Germany (C.N.); Department of Nuclear Medicine, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany (T.E., C.F.); Institute for Biometry and Clinical Epidemiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany (U.G., L.M.); and Department of Radiology, Campus Virchow Klinikum, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany (D.G., B.H.).
Multifrequency magnetic resonance elastography (MRE) significantly improves detection of metastatic lymph nodes, even small ones missed by standard criteria. This stiffness-based imaging offers a valuable addition to current tumor evaluation methods.
Area of Science:
- Medical Imaging
- Oncology
- Diagnostic Techniques
Background:
- Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 is a standard for tumor evaluation.
- RECIST 1.1's reliance on short axis diameter (SAD) limits detection of small metastatic lymph nodes.
- Quantitative analysis of nodal status is crucial for accurate cancer staging.
Purpose of the Study:
- To evaluate the utility of multifrequency magnetic resonance elastography (MRE) in detecting lymph node metastasis.
- To assess MRE's value as an adjunct to RECIST 1.1 criteria.
- To determine if MRE can improve the detection of small metastatic lymph nodes missed by SAD measurements.
Main Methods:
- Prospective examination of 25 benign and 82 metastatic lymph nodes using multifrequency MRE at 1.5 T.
- Tomoelastography postprocessing at 30, 40, 50, and 60 Hz to measure shear wave speed (stiffness).
- Comparison of MRE diagnostic performance against RECIST 1.1 (SAD) using positron emission tomography-computed tomography as the reference standard.
Main Results:
- Metastatic lymph nodes exhibited significantly higher stiffness (1.90 m/s) than benign nodes (0.98 m/s).
- MRE demonstrated improved sensitivity (0.84), negative predictive value (0.66), and accuracy (0.88) compared to SAD alone (0.56, 0.41, 0.66).
- Combining MRE with SAD further enhanced diagnostic performance (sensitivity 0.88, NPV 0.71, accuracy 0.91).
Conclusions:
- Multifrequency MRE enhances metastatic abdominal lymph node detection by 25%, particularly for nodes with SAD ≤10 mm.
- Tissue stiffness measurement via MRE is a rapid and effective supplement to RECIST 1.1.
- MRE offers a promising new tool for improving the accuracy of lymph node metastasis evaluation.
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