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Table 18 Characteristics of Solitary Pulmonary Nodules
Variable
Benign
Malignant
Age
< 30 years
> 50 years
Calcification
Popcorn, dense, concentric
None or minimal
Nodule edge
Smooth, round
Irregular, spiculated
Smoking history
Never smoked
> 20 pack-years
Size of diameter
< 1.5 cm
> 1.5 cm