Skip Navigation LinksHome > September/October 2011 - Volume 35 - Issue 5 > Nodal Staging of Rectal Cancer: High-Resolution Pelvic MRI V...
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Journal of Computer Assisted Tomography:
doi: 10.1097/RCT.0b013e318225720f
Abdominal Imaging

Nodal Staging of Rectal Cancer: High-Resolution Pelvic MRI Versus 18F-FDGPET/CT

Kim, Dae Jung MD*†; Kim, Joo Hee MD*; Ryu, Young Hoon MD‡; Jeon, Tae Joo MD‡; Yu, Jeong-Sik MD*; Chung, Jae-Joon MD*

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Abstract

Aim: To compare high-resolution pelvic magnetic resonance imaging (MRI) with positron emission tomography (PET)/computed tomography (CT) for the preoperative assessment of nodal staging in rectal cancer.

Materials and Methods: Thirty patients who had surgery for rectal cancer were retrospectively enrolled during a 6-month period. Each patient underwent high-resolution pelvic MRI and PET/CT preoperatively within the same week. An experienced radiologist predicted nodal staging on MR, and an experienced nuclear medicine physician similarly predicted nodal staging on PET/CT. Their predictions were compared with pathologic staging results, retrospectively.

Results: The accuracies of nodal status prediction from MR and PET/CT were 83% and 70%, respectively. Magnetic resonance imaging had a sensitivity of 94% and a specificity of 67%, whereas PET/CT had a sensitivity of 61% and a specificity of 83%. A combination of MRI and PET/CT revealed a sensitivity of 94%, a specificity of 83%, and an accuracy of 90%.

Conclusion: High-resolution pelvic MRI was more accurate than PET/CT for the prediction of regional nodal status. Magnetic resonance imaging had a high sensitivity and PET/CT had a high specificity for N staging in rectal cancer.

© 2011 Lippincott Williams & Wilkins, Inc.

  

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