Preoperative Diagnosis of Lymph Node Metastasis in Patients with Rectal Cancer by Magnetic Resonance Imaging(MRI).

概要

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Thirty five patients with rectal cancer were evaluated with MRI as to lymph node metastasis before surgery. After the surgical and pathologic data were knowen, the relation between metastasis and a maximum diameter of lymph node on a glass slide was investigated and MRI was reevaluated.<BR>Although it was not always easy to identify a lymph node on MRI as pathologically positive one, the incidence of metastasis was significantly higher in patients with lymph nodes larger than 1.0 cm in maximum diameter (upward ; p<0.005, lateral; p<0.001).<BR>In the upward lymph nodes, MRI had a accuracy of 76.6 %, a sensitivity of 69.2 %, and a specificity of 85.0 %, whereas in the lateral lymph nodes it had a accuracy of 84.0 %, a sensitivity of 80.0 %, and a specificity of 85.0 % respectively.<BR>Thus MRI was considered to be a useful and effective tool in diagnosis of lateral lymph node metastasis of rectal cancer and to understand the complicated anatomy of the pelvis.
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