Usefulness of endoscope guided transabdominal ultrasonography in T staging of colorectal cancer.

Background/aims: We investigated the efficacy of endoscope guided transabdominal ultrasonography (EGTUS) for the evaluating the depth of colorectal cancer invasion.

Methodology: The subjects were 52 patients with colon cancer and 30 patients with rectal cancer who underwent transabdominal US and curative surgery. During endoscopy, we applied transabdominal US by filling the area around the tumor with de-gassed water.