Preoperative staging of rectal cancer using magnetic resonance imaging with external phase-arrayed coils

Archives of Surgery
Giuseppe GagliardiRonald R Salem

Abstract

Rectal cancer can be accurately staged preoperatively by magnetic resonance imaging (MRI) with external phase-arrayed coils. Comparison of MRIs with pathologic staging. University hospital. Twenty-eight consecutive patients with biopsy-proven rectal cancer who did not undergo irradiation. Patients underwent imaging using a 1.5-T MRI scanner with external phase-arrayed surface coils. Streaking of the perirectal fat and disruption of the bowel wall margin were interpreted as transmural invasion. Lymph nodes were defined as metastatic when they had a diameter of at least 0.5 cm. Tumors were staged according to the TNM staging system (American Joint Committee on Cancer guidelines) as confined to the bowel wall (T1-T2) and invading through the bowel wall (T3-T4). Patients underwent anterior resection (n = 15), abdominoperineal resection (n = 11), or local excision (n = 2). Calculation of sensitivity, specificity, and accuracy for invasion through the bowel wall and lymph node status. Sensitivity of MRI in detecting invasion through the bowel wall was 89% (16/18), specificity was 80% (8/10), and accuracy was 86% (24/28). Sensitivity for malignant lymphadenopathy was 67% (8/12), specificity was 71% (10/14), and accuracy 69% (18/26). A...Continue Reading

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