{"entity":{"id":"c-rads","kind":"term","name":"C-RADS (CT Colonography Reporting and Data System)","aka":["C-RADS","CT Colonography Reporting and Data System"],"tldr":"C-RADS gives a CT colonography (virtual colonoscopy) report two scores, one for polyps in the bowel and one for anything else seen outside it, each with the follow-up it needs.","summary":"C-RADS was proposed in 2005 (Zalis and colleagues, Radiology) and is now an American College of Radiology system. It has separate categories for colorectal findings (C) and for extracolonic findings (E), the organs outside the bowel that the scan also shows.\n\nThe version 2023 update (Yee and colleagues, Radiology 2024) added a subcategory, C2b, for mass-like narrowing from diverticular disease, which is likely benign, and merged extracolonic categories E1 (normal variant) and E2 (clinically unimportant) into one, E1/E2, because neither needs follow-up.","asOf":"2026-11-04","links":[{"label":"Yee et al., CT Colonography Reporting and Data System (C-RADS): version 2023 update (Radiology 2024)","url":"https://doi.org/10.1148/radiol.232007"},{"label":"Zalis et al., CT colonography reporting and data system: a consensus proposal (Radiology 2005)","url":"https://doi.org/10.1148/radiol.2361041926"},{"label":"American College of Radiology, C-RADS","url":"https://www.acr.org/clinical-resources/clinical-tools-and-reference/reporting-and-data-systems/c-rads"}],"tags":[],"related":["colonoscopy"],"cancers":["colorectal"],"sections":[],"technologies":["ct","colorectal-screening"],"targets":[],"drugs":[],"companies":[],"institutions":[],"pathways":[],"terms":[],"trials":[],"people":[],"bottlenecks":[],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"category":"Diagnostics & imaging"},"route":"/terms/c-rads/","neighbours":{"term":[{"id":"colonoscopy","kind":"term","name":"Colonoscopy","route":"/terms/colonoscopy/"},{"id":"pi-rads","kind":"term","name":"PI-RADS (Prostate Imaging Reporting and Data System)","route":"/terms/pi-rads/"}],"cancer":[{"id":"colorectal","kind":"cancer","name":"Colorectal cancer","route":"/cancers/colorectal/"}],"technology":[{"id":"colorectal-screening","kind":"technology","name":"Colorectal cancer screening (colonoscopy, FIT, stool DNA, blood)","route":"/technologies/colorectal-screening/"},{"id":"ct","kind":"technology","name":"CT (computed tomography)","route":"/technologies/ct/"}]}}