Sensitivity of endorectal ecography in the staging of rectal chancre: correlation with pathological staging

摘要

OBJECTIVE: This study aimed to evaluate endorectal ultrasound sensibility, in our experience, in rectal cancer staging comparing with pathologic result. METHODS: A retrospective study between January 2005 and August 2009. We calculated sensibility, specificity, positive and negative predictive value for T and N. Through ROC curves we evaluated endoscopic ultrasound accuracy and through McNemar test we compared it with the anatomopathological result. RESULTS: Of 112 patients, 76 met the inclusion criteria. We obtained an efficiency of 75 to 97% for uT and 75% in uN. There was a sensibility, specificity, positive and negative predictive value, respectively of 63, 98, 92 and 89% for uT1, 71% and 76, 54 and 88 for uT2, 67, 81; 73 and 76% for uT3, 100, 97, 60 and 100% uT4, and 39, 91, 62 and 78% for uN. The ROC curves indicated that endorectal ultrasound is a good test for T staging and reasonable for N staging. The McNemar test revealed no significant differences between endoscopic ultrasound and histological staging (p0.05). CONCLUSIONS: We concluded that endorectal ultrasound is an important tool in rectal cancer staging, showing a good correlation with histopathological results.