Variable | Definition |
---|---|
Type | Central, tumour located in the segmental or more proximal bronchi; peripheral, tumour located in the subsegmental bronchi or more distal airway |
Location | The distribution of each lesion in the lung was recorded, including left upper lobe, left lower lobe, right upper lobe, right middle lobe and right lower lobe |
Relationship of location between multiple lesions in same patient | Same lung segment, same lung lobe, ipsilateral lung and heterolateral lung |
Tumor size | Longest diameter of the tumor in MPR images |
Ground glass opacity | Ground glass dense nodules with internal vessels and bronchi visible |
Mix ground glass opacity | Composition of both ground glass opacity and solid |
Pure ground glass opacity | Composition of ground glass opacity only |
Texture | Predominantly solid, Tumour solid component / ground glass component > 0.5; Predominantly ground glass opacity, tumour solid diameter / ground glass diameter ≤ 0.5 |
Shape | indicated as lobulated, others (round, or oval) |
Lobulated | The surface of the tumor showed as multiple arc-shaped projections |
Margin | Evaluated in the lung window, and indicated as smooth, or spiculated |
Spiculate | Evaluated in the lung window, and indicated as different degrees of spinous or burr-like protrusions at the tumour margin |
Margin definition | evaluated in the lung window, and indicated as well-defined, or poor-defined |
Air bronchogram | Tubelike or branched air structure within the tumour |
Bubble-like lucency | The 1 ~ 3 mm of air density area within the mass |
Margins | Evaluated in the lung window, and indicated as smooth, or spiculated |
Heterogeneity | Evaluated in the soft tissue window, and heterogeneity indicated as the difference of CT values in tumor was greater than 20HU |
Pleural attachment | Retraction of the pleura toward the tumour |
Cavitation | Presence or absence of cavitation |
Intramodular calcifications | Presence or absence of calcifications |
Necrosis | Low-density area in the tumour, without enhancement in enhance CT |
Peripheral emphysema | Presence or absence of peripheral emphysema |
Peripheral fibrosis | Pulmonary fibrosis around the tumor |
Vascular convergence | Convergence of vessels to the tumor, applied to the peripheral tumors |
Enhancement | mild” = 0 ~ 20 HU; “moderate” = 20 ~ 40 HU, “marked” > 40 HU |
Lymphadenopathy | presence or absence of lymphadenopathy thoracic lymph nodes (hilar or mediastinal) with short-axis diameter greater than 1 cm |