Primary Sjögren's syndrome with chronic tubulointerstitial nephritis and lymphadenopathy mimicking IgG4-related disease

Mitsuhiro KawanoDivision of Rheumatology, Kanazawa University Hospital, Kanazawa, Ishikawa, JapanCorrespondence[email protected]

Yasunori SuzukiDivision of Rheumatology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan

Kazunori YamadaDivision of Rheumatology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan

Ichiro MizushimaDivision of Rheumatology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan

Masami MatsumuraResearch Center for Medical Education, Kanazawa University Graduate School of Medicine, Kanazawa, Ishikawa, Japan

Kenichi NakajimaDepartment of Nuclear Medicine, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan

Masakazu YamagishiDivision of Cardiology, Department of Internal Medicine, Kanazawa University Graduate School of Medicine, Kanazawa, Ishikawa, Japan

Yutaka YamaguchiYamaguchi's Pathology Laboratory, Chiba, Japan

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Abstract

We describe a 62-year-old woman with Sjögren's syndrome (SS) presenting with tubulointerstitial nephritis (TIN) and lymphadenopathy mimicking IgG4-related disease (IgG4-RD). Computed tomography revealed multiple swollen lymph nodes. Biopsy of the largest lymph node showed reactive lymphadenopathy with dense IgG4 positive plasma cell (IgG4 + PC) infiltration. Renal biopsy showed chronic plasma cell-rich TIN with IgG4 + PC infiltration. This case suggests that Immunoglobulin G4 immunostaining does not always support the diagnosis of IgG4-RD in the differential diagnosis between SS and IgG4-RD.

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Acknowledgement

We thank John Gelblum for his critical reading of the manuscript. This work was supported by Intractable Diseases, the Health and Labor Sciences Research Grants from Ministry of Health, Labor and Welfare, Japan.

Conflict of interest

None.

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Primary Sjögren's syndrome with chronic tubulointerstitial nephritis and lymphadenopathy mimicking IgG4-related disease

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