PFNs are frequently seen on screening CT scans obtained in highrisk subjects. Although PFNs may show increased size at followup CT, the authors in this study found none that had developed into lung cancer; this suggests that the malignancy potential of PFNs is low. (c) RSNA, 2010. Perifissural nodules seen at CT screening for lung cancer Radiology. 2010 Mar;254(3):94956. doi: /radiol ...