Figure 2.

70-year-old female current smoker with a previous history of breast cancer, enrolled in lung cancer screening program. (a) Low-dose CT lung cancer screen study (screen 2) demonstrating new right lower lobe new tree in bud nodules, Lung-RADS 4a, probably infectious or inflammatory in aetiology. (b) Subsequent repeat short interval CT (3 months) demonstrated 15 mm right lower lobe spiculated solid nodule, Lung-RADS 4b, at site of previous tree in bud nodules, again favoured to be infectious or inflammatory. This lesion was subsequently biopsied and was confirmed as organizing pneumonia and resolved on follow-up imaging.