An 86-year-old woman with adenocarcinoma after SRT. A) Dosimetry overlaying CT with a bone window shows the maximum prescribed dose to the chest wall as 63 Gy, with a BED3 of 233.2 Gy. The site of rib fracture later is indicated by a black elliptical cercle. B) Rib fracture was noted at 24 months after completion of SRT. Amorphous osteosclerosis is also seen (arrow).