Evaluation of MRI characterisation of histopathologically matched lymph nodes and other mesorectal nodal structures in rectal cancer
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View abstract on PubMed
Summary
This summary is machine-generated.Current MRI criteria for rectal cancer nodal staging, including the European Society of Gastrointestinal and Abdominal Radiology (ESGAR) criteria, show potential but require caution due to limited accuracy in predicting malignancy. Further validation is needed for precise nodal staging.
Area Of Science
- Radiology
- Oncology
- Gastroenterology
Background
- Accurate lymph node staging in rectal cancer is critical for effective treatment planning.
- Current magnetic resonance imaging (MRI) criteria for assessing mesorectal nodal structures have limitations.
Purpose Of The Study
- To evaluate the diagnostic performance of current MRI-based criteria for malignancy in mesorectal lymph nodes in rectal cancer.
- To assess the utility of the 2016 European Society of Gastrointestinal and Abdominal Radiology (ESGAR) consensus criteria for nodal staging.
Main Methods
- Anatomical comparison of mesorectal nodal structures on baseline MRI with histopathological findings (lymph nodes, tumor deposits, extramural venous invasion).
- Inclusion of matched nodal structures from primary surgery patients and all malignant nodes from neoadjuvant treatment patients.
- Logistic regression analysis of morphological criteria (irregular margin, round shape, heterogeneous signal, size) and ESGAR criteria against histopathological nodal status.
Main Results
- Short-axis diameter ≥ 5 mm (OR 21.43) and heterogeneous signal (OR 9.02) were significantly associated with malignancy in univariable analysis.
- Nodal size remained the strongest predictor in multivariable analysis (OR 12.32).
- The ESGAR criteria showed an odds ratio of 8.23 for malignant outcome, with a sensitivity of 54% and specificity of 85%.
Conclusions
- Morphological and size criteria play a role in predicting lymph node metastases in rectal cancer.
- Current MRI criteria, including ESGAR consensus criteria, may not be sufficiently accurate for definitive nodal staging.
- These criteria should be used cautiously in clinical practice, highlighting the need for improved nodal staging methods.
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