🧫 CT Colonography C-RADS Classification
Get the colonic (C0–C4) and extracolonic (E0–E4) categories and management for CT colonography per C-RADS v2023. Instant, browser-side.
CT Colonography C-RADS Classification
Colonic category (C)
Extracolonic category (E, optional)
When to use
Classify a CT colonography study and set the management for both colonic and extracolonic findings.
How it works
C1 normal → routine screening (5–10 yr); C2 (1–2 polyps 6–9 mm) → CTC surveillance ~3 yr or colonoscopy; C3 (≥ 10 mm or ≥ 3 polyps 6–9 mm) → colonoscopy; C4 suspected malignant → surgical/oncology referral.
Key points
- Category set by the highest-grade lesion.
- v2023 adds C2b (diverticular mass-like stricture) and merges E1/E2.
- Extracolonic E1/E2 need no follow-up; E3 work-up as indicated; E4 further management.
- E0 extracolonic reporting is optional in v2023.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.