Related Experiment Videos
Pre-operative staging of recto-sigmoid colon carcinoma by upper gastrointestinal endoscopic ultrasonography
1Department of Gastroenterology, Tainan Municipal Hospital, Taiwan, ROC.
Background/Aims:
To assess the accuracy of a new generation endoscopic ultrasonography (EUS)(GF-M200) in pre-operative staging of recto-sigmoid colon carcinoma invasion and lymph node metastasis.
Methodology:
Seventy-three patients with biopsy proven colon cancer were included in this study. These comprised 60 patients with rectal carcinoma and 13 patients with sigmoid carcinoma. All patients were pre-operatively examined by EUS. Pathological findings of the depth of tumor invasion and presence of lymph node metastasis were correlated with EUS.
Results:
EUS has an overall accuracy rate of 89% in staging of recto-sigmoid cancer. The diagnostic accuracy rate was 83% for T1, 83% for T2, 93% for T3, and 71% for T4. Understaging and overstaging occurred in 6% and 6%, respectively. In determining lymph node metastasis, the overall accuracy rate was 77%, with a sensitivity and specificity rate of 77% and 76%, respectively.
Conclusions:
EUS is a valuable staging modality in the staging of the depth of tumor invasion, not only for rectal carcinoma but also for tumors located at the sigmoid colon.