Preoperative staging of rectal cancer by endoluminal ultrasound vs. magnetic resonance imaging. Preliminary results of a prospective, comparative study.

Second Department of Surgery, Regional Hospital of Bolzano, Italy.
Diseases of the Colon & Rectum (Impact Factor: 3.75). 01/1995; 37(12):1189-93.
Source: PubMed


The aim of this study was to compare the value of endoluminal ultrasonography (ELUS) with magnetic resonance imaging (MRI) for preoperative staging of rectal carcinoma.
Thirty-seven consecutive patients were examined by ELUS and MRI. Imaging results were compared with pathohistologic studies. A tumor extending beyond the bowel wall was considered to be "positive" and one within the bowel wall was considered "negative." Lymph node involvement was considered present if nodes equal to or greater than 5 mm in diameter were found in the perirectal tissue. For evaluating the differences between the two methods, the Mc Nemar test was performed.
T-Staging was correct in 88.2 percent (30/34) of patients by ELUS and in 82.3 percent (28/34) by MRI (difference not significant). N-Staging was correct in 80 percent (20/25) by ELUS and in 60 percent (15/25) by MRI (difference of borderline significance). A comprehensive preoperative staging (T + N) was made correctly in 68 percent (17/25) by ELUS and in 48 percent only (12/25) by MRI (difference not significant).
We suggest that ELUS and MRI must be evaluated within the framework of established parameters when treatment modalities such as preoperative radiation therapy and local or radical surgical approach must be decided.

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    • "The accuracy to determine metastatic nodal involvement by EUS is approximately 70–75% [18,19,28] compared with CT (55–65%) [20,29] and MR imaging (60–70%) [19,30]. Nodal staging by EUS is less accurate than tumor staging due to difficulty of detecting tumor within a lymph node. "
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    ABSTRACT: Accurate staging of rectal cancer is essential for selecting patients who can undergo sphincter-preserving surgery. It may also identify patients who could benefit from neoadjuvant therapy. Clinical staging is usually accomplished using a combination of physical examination, CT scanning, MRI and endoscopic ultrasound (EUS). Transrectal EUS is increasingly being used for locoregional staging of rectal cancer. The accuracy of EUS for the T staging of rectal carcinoma ranges from 80-95% compared with CT (65-75%) and MR imaging (75-85%). In comparison to CT, EUS can potentially upstage patients, making them eligible for neoadjuvant treatment. The accuracy to determine metastatic nodal involvement by EUS is approximately 70-75% compared with CT (55-65%) and MR imaging (60-70%). EUS guided FNA may be beneficial in patients who appear to have early T stage disease and suspicious peri-iliac lymphadenopathy to exclude metastatic disease.
    Full-text · Article · Feb 2006 · International Seminars in Surgical Oncology
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    • "MR imaging has been used increasingly for preoperative local staging of rectal carcinomas (10-12). In our institution, unenhanced hepatic MR imaging is routinely incorporated into a preoperative MR examination for the purpose of providing an all-in-one staging procedure. "
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    ABSTRACT: To assess the follow-up results after negative findings on unenhanced hepatic MR imaging in rectal cancer patients who have undergone locally curative surgery. From all pertinent imaging reports and medical records, we selected 255 patients who had negative results on unenhanced hepatic MR imaging. When selecting patients who had undergone curative resection, the following patients were excluded from the study: 1) patients in whom extrahepatic metastases were detected on preoperative staging work-ups, 2) patients in whom the surgery was judged to be non-curative due to peritoneal seeding or local aggressiveness. Cases with follow-up periods of less than 18 months were also excluded, as these cases were considered insufficient to confirm the negative outcomes. Thus, a total of 149 patients were ultimately enrolled in our study. The follow-up results of unenhanced MR imagings were assessed according to the assumption that the newly developed hepatic metastases had been false-negative lesions on preoperative MR image. During a median follow-up period of 29.3 months, 25 hepatic metastases were detected in 13 patients (8.7%), which indicated a negative predictive value of 91.3%. Unenhanced hepatic MR imaging provides a high negative predictive value with regard to the detection of hepatic metastasis in the preoperative evaluation of rectal cancer.
    Full-text · Article · Dec 2004 · Korean Journal of Radiology
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    ABSTRACT: Background: Thirty to forty percent of villous adenomas can be an occult carcinoma. Even biopsy can miss the diagnosis. Rectal endosonography can be useful to detect these malignant tumors. Aim: To assess the usefulness of rectal endosonography to detect invasive carcinoma and eventual lymph node involvement in villous adenomas. Material and methods: Retrospective review of 1400 rectal endosonographies performed between years 2000 and 2006. Those cases in which a rectal villous adenoma was informed, that were subjected to surgical excision and that had a pathology report were included in the study. Results:
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