ecrin-mdr-crcClinical2017colorectal cancer with stenosisColorectal Cancer With StenosisObservationalhttps://newmdr.ecrin.org/Study/2643705Japan9ECRIN MDRCompletedfalseEfficacy of preoperative ultrathin colonoscopy for colorectal cancer with stenosisPrimary outcome(s): Passage rate and cecal insertion rate2017-09-152643705JPRN-UMIN000028505