Background/aim: IgG4-related disease (IgG4RD) is a rare autoimmune proinflammatory condition that mimics other cancers and has unique pathological findings. The effects of radiotherapy in patients with IgG4RD remain unknown.
Case Report: A male patient in his seventies who received radiotherapy (68 Gy/39 fr) for bladder cancer 5 months prior, presented to our hospital with fatigue and swelling in both legs.