Lung-RADS
Structured reporting for low-dose CT (LDCT) lung cancer screening. Categorize the most suspicious nodule by type (solid, part-solid, non-solid/GGN), mean diameter, and whether it is new or growing to assign a category (0, 1, 2, 3, 4A, 4B, 4X) with a defined management pathway. Size is the mean of long- and short-axis diameters.
2022 (v2022)·reviewed 2026-07-01
- Assign the overall category based on the most suspicious nodule.
- Category applies to lung cancer screening LDCT, not diagnostic or incidental-nodule (Fleischner) settings.
- Growth of a category 3 or 4A nodule increases the category; unchanged or decreasing 3/4 findings for ≥3 months may be assessed as category 2.
- The S modifier flags significant incidental findings and does not change the numeric lung-cancer category.
Category
Enter nodule type and size to compute the category.
Sources
- American College of Radiology Lung CT Screening Reporting & Data System (Lung-RADS) v2022. American College of Radiology, 2022.source
Educational reference for clinicians — not medical advice. Verify against the primary source before acting on it; guidelines change. Final decisions rest with the interpreting physician and your institution's protocols.