(a) Computed tomography demonstrates a band-like soft tissue mass on the right side of the thoracic vertebrae (T6-T9) (arrow marked). IgG4-related disease (IgG4-RD) is a systemic immune-mediated fibro-inflammatory disorder that affects multiple organs. Google Scholar PubMed OpenURL Placeholder Text WorldCat 2 Zhang Z, Guan W, Lin Q, Yu W. Thoracic paravertebral involvement in patients with IgG4-related disease: CT and MR imaging findings.