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MRI Evaluation of Rectal Cancer Lymph Node Staging Using Apparent Diffusion Coefficient.

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Apparent diffusion coefficient (ADC) MRI shows distinct ADC values for rectal tumors and lymph nodes, aiding in cancer staging. Treatment type influences ADC values in lymph nodes, impacting diagnostic accuracy.

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Area of Science:

  • Radiology
  • Oncology
  • Medical Imaging

Background:

  • Colorectal cancer is a leading global cancer diagnosis.
  • Lymph node metastasis significantly impacts patient prognosis.
  • Advanced MRI techniques like diffusion-weighted imaging (DWI) are crucial for detecting lymph node metastases.

Purpose of the Study:

  • To evaluate the effectiveness of apparent diffusion coefficient (ADC) MRI in staging rectal cancer lymph node metastases.
  • To compare ADC values between tumors and lymph nodes.
  • To assess the influence of different treatment modalities (chemotherapy vs. chemoradiotherapy) on ADC values.

Main Methods:

  • Prospective study of 89 stage II-III rectal cancer patients.
  • All patients underwent 1.5T MRI with T2-weighted and DWI sequences.
  • Regions of interest were defined on tumors, lymph nodes, and rectal wall to calculate ADC values.

Main Results:

  • Rectal cancer ADC showed an AUC of 0.688 (cutoff: 0.99 x 10-3 mm2/s).
  • Lymph node ADC showed an AUC of 0.508 (cutoff: 0.9 x 10-3 mm2/s).
  • No correlation was found between tumor and lymph node ADC values. Treatment type influenced ADC differences in inguinal lymph nodes.

Conclusions:

  • ADC-MRI can differentiate between rectal tumors and lymph nodes.
  • ADC values in lymph nodes differ based on treatment received.
  • ADC-MRI shows potential for improving lymph node staging in rectal cancer.