Table 1.

Pulmonary nodule scoring system

Pulmonary nodule score	Lung findings
0 No evidence of malignancy	1 Normal lungs
	2 Stable pulmonary nodules for 2 years
	3 Homogeneous calcified nodules
	4 Opacities not related to malignancy (i.e. atelectasis, congestive heart failure, pulmonary scarring/fibrosis, emphysema)
1 Indeterminate	1 Solitary pulmonary nodules <5 mm
	2 Pulmonary nodules <5 mm with short-interval stability (<2 years)
	3 Pleural effusion, pleural plaques, and infectious/inflammatory ground glass and tree-in-bud opacities
2 Suspicious	1 Solitary pulmonary nodule of >5 mm
	2 Multiple pulmonary nodules
3 Definite metastasis(es)	1 Multiple, bilateral, peripheral, lower lobe pulmonary nodules of varying size (haematogenous spread)
	2 Diffuse nodular interstitial thickening (lymphangitic spread)
	3 New and/or enlarged pulmonary nodule(s) over time
	4 Biopsy-proven metastasis
	5 Malignant lymphadenopathy