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Published on: December 15, 2014
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Detection of axillary lymph node metastasis with diffusion-weighted MR imaging
Mami Iima1, Masako Kataoka2, Ryosuke Okumura3
1Dept of Diagnostic Radiology, Kyoto University Graduate School of medicine, Kyoto, Japan; Dept of Radiology, Kitano Hospital, Osaka, Japan.
Clinical Imaging
|June 9, 2014
Summary
Diffusion-weighted MRI can detect axillary lymph node (LN) metastases. Metastatic LNs showed lower apparent diffusion coefficient (ADC) values, but LN diameter measurements were more effective for diagnosis.
Area of Science:
- Radiology and Medical Imaging
- Oncology
- Diagnostic Imaging
Background:
- Accurate detection of axillary lymph node (LN) metastases is crucial for breast cancer staging and treatment planning.
- Diffusion-weighted magnetic resonance imaging (DW-MRI) is a promising technique for non-invasive assessment of tissue characteristics.
Purpose of the Study:
- To evaluate the feasibility of using diffusion-weighted MRI to detect axillary LN metastases.
- To compare the diagnostic performance of apparent diffusion coefficient (ADC) values with LN size measurements.
Main Methods:
- Retrospective analysis of DW-MRI scans from 75 patients with axillary lymph nodes.
- Calculation of relative ADC values (using b values of 0 and 1000 s/mm(2)) for each LN.
- Comparison of LN dimensions (area, long and short diameter) between metastatic and non-metastatic LNs.
Main Results:
- Metastatic axillary LNs exhibited significantly lower relative ADC values compared to non-metastatic LNs (P=.00).
- The diagnostic performance for detecting metastases was superior for LN long and short diameters (AUC: 0.84, 0.80) compared to mean ADC (0.64) and relative ADC (0.03).
Conclusions:
- DW-MRI can aid in detecting axillary LN metastases.
- LN diameter measurements demonstrate higher diagnostic utility than ADC values for identifying axillary LN metastases in this cohort.
