Sigmoidoscopy (image) NIH/National Cancer Institute Caption A thin, lighted tube is inserted through the anus and rectum and into the lower part of the colon to look for abnormal areas. Credit Terese Winslow for NCI Usage Restrictions This image is copyright protected. Any use of this image is subject to prevailing copyright laws. U.S. Government has reuse rights. Please contact the rights holder of this image, Terese Winslow (email@example.com) for permission requests. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.