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이혈구 감소증이 동반된 Immunoglobulin G4 연관 간질성 신염
이순규 ( Soonkyu Lee ),박윤정 ( Yune Jung Park ),조의주 ( Uiju Cho ),최영진 ( Young Jin Choi ),김완욱 ( Wan Uk Kim ) 대한류마티스학회 2015 대한류마티스학회지 Vol.22 No.6
Immunoglobulin G4-related disease (IgG4-RD) is a systemic inflammatory disease found in many organs including biliary tract, salivary gland, kidney, and lung. Tubulointerstitial nephritis is the most common renal manifestation, but hematologic involvement of IgG4-RD is rare. Here, we report on a case of a 57-year-old male with IgG4-related interstitial nephritis with bicytopenia, which was initially thought to be systemic lupus erythematosus. He presented with proteinuria, anemia, thrombocytopenia, and low complement levels. Histological findings showed an increased number of IgG4-positive plasma cells (>200/high power field), and an elevated IgG4/IgG ratio (>90%). Serum levels of IgG and IgG4 were also increased. This case emphasized the importance of differential diagnosis of IgG4-RD and immune complex glomerulonephritis. (J Rheum Dis 2015;22:401-404)