UW Emergency Radiology

Lung-RADS™ Version 1.1

Classification Description Notes
0

(Incomplete)

Additional lung cancer screening CT images and/or comparison to prior chest CT examinations is needed
1

(Negative)

No nodules and definitely benign nodules  

 

Continue annual screening with LDCT in 12 months

 

2

(Benign Appearance or Behavior)

Nodules with a very low likelihood of becoming a clinically active cancer due to size or lack of growth
3

(Probably Benign)

Probably benign finding(s) – short term follow up suggested; includes nodules with a low likelihood of becoming a clinically active cancer  

6 month LDCT

 

4A

(Suspicious)

 

 

Findings for which additional diagnostic testing and/or tissue sampling is recommended

3 month LDCT; PET/CT may be used when there is a ≥ 8 mm solid component
4B

(Suspicious)

chest CT with or without contrast, PET/CT and/or tissue sampling depending on the *probability of malignancy and comorbidities. PET/CT may be used when there is a ≥ 8 mm solid component.
S (Significant – Other)
C (Prior Lung Cancer)

*Lung cancer risk calculator: https://www.uptodate.com/contents/calculator-solitary-pulmonary-nodule-malignancy-risk-brock-university-cancer-prediction-equation

 References:

McKee, B. J., et al. (2015). “Performance of ACR Lung-RADS in a clinical CT lung screening program.” J Am Coll Radiol 12(3): 273-276.

https://www.acr.org/Quality-Safety/Resources/LungRADS