Lung fibrosis in systemic sclerosis - grading by Wells et al.

Wells classification of lung involvement in systemic sclerosis is a quantitative scoring method of disease extent and severity. All lobes are scored independently. Maximum score for each lobe is 5.

Grade Description
1 Ground glass opacity alone
2 Ground glass opacity > reticular pattern extent
3 Ground glass opacity = reticular pattern extent
4 Ground glass opacity < reticular pattern extent
5 Reticular pattern alone


1. Assayag D., Kaduri S., Hudson M., Hirsch A., Barton M. High Resolution Computed Tomography Scoring Systems for Evaluating Interstitial Lung Disease in Systemic Sclerosis Patients. Rheumatology 2012;S1:003.
2. Wells AU, Hansell DM, Corrin B, Harrison NK, Goldstraw P, et al. High
resolution computed tomography as a predictor of lung histology in systemic sclerosis. Thorax 1992;47:738-742.