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Fig. 2A —Malignant pulmonary nodule in 65-year-old man who is a smoker. Unenhanced axial transverse CT image shows 11-mm lobulated nodule in right upper lobe, which is likely to be malignant given patient's age and smoking status and size and lobulated contours of nodule. Nodule was detected on routine chest radiograph with patient being asymptomatic.