Small-Dose Endoscopic Tattooing Using a Novel Needle for Localization Prior to Laparoscopic Surgery of Colorectal Cancer.

Prior to laparoscopic surgery for colorectal cancer, our endoscopic tattooing with a standardized protocol using a novel needle is considered a simple, highly reliable localization technique with an extremely safe profile, which would be valuable to reduce physician's efforts and redundant medical resources. Trial registration number UMIN000021012. Date of registration: June 2016.