A linear sigmoid colon passage method in colonoscopy
We discovered a phenomenon whereby the rectosigmoid junction becomes linear when the patient is moved from a left lateral to left semiprone position and the colonoscope can be readily inserted into the sigmoid colon.
Figure 1. The phenomenon we discovered. The colonoscope tip reached the rectosigmoid junction. When the endoscopist moved the patient from a left lateral to left semiprone position with the colonoscope slightly pushed with twisting to the left, the visual field broadened, both the rectosigmoid junction and colonoscope simultaneously became linear, and the colonoscope tip was readily inserted into the sigmoid colon. Rectosigmoid junction (▲).
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