[A case of Sjögren's syndrome with retrobulbar optic neuritis and cutaneous vasculitis].

A 52-year-old woman, diagnosed as having Sjögren's syndrome by parotid sialography and lip biopsy after a two years history of recurrent purpuric rashes on her lower extremities, was admitted to our hospital because of visual disturbance in March 1998. On presentation at the department of ophthalmology, her right visual acuity was light perception, and laboratory findings showed elevated levels of antinuclear antibody and anti-Ro/SS-A and anti-La/SS-B antibodies. Cerebrospinal fluid analysis showed mild pleocytosis and elevated levels of total protein and Q-albumin. The IgG-index was within normal level and no oligoclonal band was found. Magnetic resonance imaging showed increased signal intensity at the right optic nerve. After treatment with m-PSL pulse therapy, her visual acuity recovered to 0.08. When prednisolone was gradually tapered to the dose of 30 mg per day, she was transferred to our department because of high grade fever and pancytopenia. She also suffered from palpable purpura in her extremities extending the trunk, whose pathological diagnosis was leukocytoclastic vasculitis. The immunohistochemical examination showed depositions of IgG and C1q. After two additional cycles of mPSL pulse therapies, clinical improvement was achieved. The titers of von Willebrand factor and thrombomodulin correlated with her clinical improvement. Patients with Sjögren's syndrome can develop extra-grandular complications, including neurologic and cutaneus diseases, it is important to understand the role of SS-A-B antibodies in the immunopathogenesis of Sjögren's syndrome.