Figure 1b. Temporal evolution of RILD in a 60-year-old woman with stage IIIb non-small cell lung cancer. (a) Chest radiograph obtained before treatment shows a nodule in the left lung (arrow) and hilar adenopathy. (b) Chest radiograph obtained 2 months after completion of radiation therapy shows radiation pneumonitis, which manifests as faint areas of increased opacity within the radiation portal. (c) Chest radiograph obtained 9 months after completion of radiation therapy shows evolution to radiation fibrosis, which manifests as increasing volume loss and consolidation. Note the sharp demarcation between the normal and irradiated lung parenchyma.