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Application of apparent diffusion coefficient values derived from diffusion-weighted imaging for assessing different
Aining Zhang1, Jiacheng Song1, Zhanlong Ma1
1Department of Radiology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, PR China.
Acta Radiologica (Stockholm, Sweden : 1987)
|October 17, 2019
Summary
Apparent diffusion coefficient (ADC) measurements can help identify metastatic lymph nodes in cervical cancer. Minimum ADC values are particularly useful for detecting micro-metastases in normal-sized lymph nodes.
Area of Science:
- Oncology
- Radiology
- Medical Imaging
Background:
- Lymph node metastasis significantly impacts survival and recurrence in cervical cancer.
- Current imaging methods struggle to detect small metastatic lymph nodes (5-10mm short axis).
Purpose of the Study:
- To evaluate the diagnostic accuracy of apparent diffusion coefficient (ADC) in differentiating metastatic lymph nodes of various sizes in cervical cancer patients.
- To assess ADC's role in identifying normal-sized versus enlarged metastatic lymph nodes.
Main Methods:
- Retrospective analysis of 133 cervical cancer patients with complete MRI, diffusion-weighted imaging, and pathology data.
- Categorization of 157 lymph nodes into benign normal-sized, metastatic normal-sized, and metastatic enlarged groups based on size and pathology.
- Comparison of mean, minimum, and maximum ADC values across the three lymph node groups.
Main Results:
- Mean ADC was significantly lower in enlarged metastatic nodes compared to both benign and normal-sized metastatic nodes.
- Minimum ADC was significantly lower in both normal-sized and enlarged metastatic nodes compared to benign nodes.
- Minimum ADC demonstrated the highest diagnostic performance (AUC 0.758) for identifying normal-sized metastatic lymph nodes.
Conclusions:
- Diffusion-weighted imaging, specifically minimum ADC, is valuable for detecting micro-metastases in normal-sized lymph nodes.
- ADC parameters can aid in differentiating enlarged metastatic lymph nodes from benign ones in cervical cancer.
