Figure 5a. RILD due to tangential-beam irradiation in a 42-year-old woman with adenocarcinoma of the right breast. (a) CT scan obtained 4 months after completion of radiation therapy shows ground-glass attenuation and nodules, which are predominantly located in the peripheral aspect of the right upper lobe. (b) CT scan obtained 26 months after completion of radiation therapy shows the typical pattern of subpleural radiation fibrosis in lung tissue adjacent to the treated chest wall region.