Chest X-ray (a) and CT scan ((b) and (c)) immediately before the administration of yttrium-90 ibritumomab tiuxetan. Chest X-ray (d) and CT ((e) and (f)) 2 months after its administration. Chest X-ray (g) and CT scan ((h) and (i)) 18 months after its administration. The abnormal shadow was significantly reduced after the administration of yttrium-90 ibritumomab tiuxetan. Radiation pneumonitis has not been reported for 18 months.