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CT scans in a 60-year-old woman undergoing low-dose lung cancer screening CT. (a) Baseline scan shows a right lower lobe part-solid nodule measuring 11 mm with 5-mm solid component (arrows). Nodule was classified as Lung-RADS category 3. (b) Scan obtained at second annual follow-up shows that nodule grew to 17 mm with 7 mm solid component (arrows). Malignancy was subsequently diagnosed.
