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Endoscopic ultrasonography in staging rectal cancer
L D Roubein1, C David, R DuBrow
1Department of Medical Oncology, University of Texas M.D. Anderson Cancer Center, Houston.
The American Journal of Gastroenterology
|October 1, 1990
Summary
Endoscopic ultrasonography (EUS) accurately stages rectal cancer invasion depth and lymph node involvement, aiding in sphincter-saving procedure decisions. This imaging technique shows higher accuracy than CT scans for predicting surgical candidacy.
Area of Science:
- Gastroenterology
- Oncology
- Medical Imaging
Background:
- Rectal cancer staging is crucial for treatment planning.
- Accurate assessment of tumor invasion depth and lymph node status is vital for selecting appropriate surgical procedures, including sphincter-saving options.
- Endoscopic ultrasonography (EUS) is a modality used for local staging of rectal cancer.
Purpose of the Study:
- To evaluate the accuracy of endoscopic ultrasonography (EUS) in staging rectal cancer.
- To compare EUS findings with histopathologic results for assessing tumor invasion and lymph node involvement.
- To determine the utility of EUS in predicting patient eligibility for sphincter-saving procedures versus abdominoperineal resection.
Main Methods:
- Endoscopic ultrasonography (EUS) using the Olympus EU-M3 system was employed to assess rectal cancer.
- EUS was used to evaluate the depth of tumor invasion through bowel wall layers and lymph node status.
- EUS findings were compared with histopathologic results in 13 patients.
- Computed tomography (CT) findings were compared with EUS and histopathology in 9 cases.
Main Results:
- EUS demonstrated agreement with histopathology in 69.3% of cases for both depth of invasion and lymph node presence (p=0.07).
- EUS correctly predicted invasion into the vaginal cuff in one patient.
- EUS showed higher accuracy (78%) than CT (33%) in detecting tumor penetration beyond the bowel wall when compared to histopathology.
- The presence of lymph nodes on EUS did not reliably predict metastatic involvement.
Conclusions:
- Endoscopic ultrasonography (EUS) is a valuable tool for local staging of rectal cancer, offering better accuracy than CT for assessing tumor invasion depth.
- EUS findings can aid in surgical decision-making, potentially identifying candidates for sphincter-saving procedures.
- Further studies are needed to confirm the predictive value of EUS for lymph node metastasis.