The First Case of Multifocal Osteonecrosis in Behcet’s Disease

Background: Osteonecrosis is death of bone tissue due to interruption of the blood supply. It can occur in autoimmune disease due to multiple mechanisms. It occurs rarely in some kind of multisystem disease such as Behcet’s disease (BD). The aim of this article is to present a case of BD with multifocal osteonecrosis. Case Presentation: A 26-year-old woman with oral aphthosis, panuveitis, and retinal vasculitis was diagnosed to have BD, and oral treatment of prednisolone (0.5 mg/kg/day) together with azathioprine (2 mg/kg/day) and intravenous (IV) cyclophosphamide (CYC) (0.75 g/m2) was administered for her. Prednisolone was tapered to 15 mg/day after 3 months. Because of unresponsiveness of eye involvement to traditional immunosuppressive therapy, infliximab (5 mg/kg) was started for her and IV CYC was discontinued. 4 months after initial therapy, she complained of her right shoulder pain. Regarding to shoulder pain, magnetic resonance imaging (MRI) showed osteonecrosis of right shoulder. After diagnosis of osteonecrosis, prednisolone was discontinued by herself. 3 months later, she complained of both knees, both hips, and right ankle pain. According to previous diagnosis of osteonecrosis of her right shoulder, MRI was done for all involved joints, which revealed osteonecrosis of all of them. After diagnosis of multifocal osteonecrosis, the following tests were done that all results were normal: anticardiolipin antibody (ACA) [immunoglobulin G (IgG), immunoglobulin M (IgM)], lupus anticoagulant (LA), anti-beta-2 glycoprotein 1 (antiB2GP1) (IgG, IgM), coagulation tests, and lipid profiles. Conclusions: Bone infarction should be considered in differential diagnosis of patients with joint pain and without the evidence of arthritis; however, it rarely occurs in patients with BD.