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Accuracy of High-Resolution MRI with Lumen Distention in Rectal Cancer Staging and Circumferential Margin Involvement Prediction
Korean Journal of Radiology ; : 37-44, 2014.
Article in English | WPRIM | ID: wpr-114859
ABSTRACT

OBJECTIVE:

To evaluate the accuracy of magnetic resonance imaging (MRI) with lumen distention for rectal cancer staging and circumferential resection margin (CRM) involvement prediction. MATERIALS AND

METHODS:

Seventy-three patients with primary rectal cancer underwent high-resolution MRI with a phased-array coil performed using 60-80 mL room air rectal distention, 1-3 weeks before surgery. MRI results were compared to postoperative histopathological findings. The overall MRI T staging accuracy was calculated. CRM involvement prediction and the N staging, the accuracy, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were assessed for each T stage. The agreement between MRI and histological results was assessed using weighted-kappa statistics.

RESULTS:

The overall MRI accuracy for T staging was 93.6% (k = 0.85). The accuracy, sensitivity, specificity, PPV and NPV for each T stage were as follows 91.8%, 86.2%, 95.5%, 92.6% and 91.3% for the group < or = T2; 90.4%, 94.6%, 86.1%, 87.5% and 94% for T3; 98,6%, 85.7%, 100%, 100% and 98.5% for T4, respectively. The predictive CRM accuracy was 94.5% (k = 0.86); the sensitivity, specificity, PPV and NPV were 89.5%, 96.3%, 89.5%, and 96.3% respectively. The N staging accuracy was 68.49% (k = 0.4).

CONCLUSION:

MRI performed with rectal lumen distention has proved to be an effective technique both for rectal cancer staging and involved CRM predicting.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Rectal Neoplasms / Rectum / Magnetic Resonance Imaging / Prospective Studies / Sensitivity and Specificity / Air / Dilatation / Neoplasm Staging Type of study: Diagnostic study / Observational study / Prognostic study / Risk factors Limits: Adult / Aged / Female / Humans / Male Language: English Journal: Korean Journal of Radiology Year: 2014 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Rectal Neoplasms / Rectum / Magnetic Resonance Imaging / Prospective Studies / Sensitivity and Specificity / Air / Dilatation / Neoplasm Staging Type of study: Diagnostic study / Observational study / Prognostic study / Risk factors Limits: Adult / Aged / Female / Humans / Male Language: English Journal: Korean Journal of Radiology Year: 2014 Type: Article