MRI of Rectal Cancers

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MRI of Rectal Cancers

• June 2003

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MRI

• T stage. Accuracy 90
• N stage. Accuracy 59-95
• Prediction of circumferential margin (CRM)

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• MRI T3
• Histology shows invasion of MP

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• MRI T3 with free circumferential margin.

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• MRI T4

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• MRI T3N1

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• Histological T2 over staged by MRI to T3

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Positive CRM by MRI, Gross and Histology
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References

• 1. Beets-Tan RG, Beets GL, Vliegen RF, Kessels
  AG, Van Boven H, De Bruine A, et al. Accuracy of
  magnetic resonance imaging in prediction of
  tumour-free resection margin in rectal cancer
  surgery. Lancet 2001357(9255)497-504.
• 2. Crawshaw A, T H, FH S. Peri-operative
  radiotherapy for rectal cancer the case for
  selective pre-operative approach - the third way.
  Colorectal Disease 20035367-372.