Objective:

To report a case of a 61-year-old man with purpura as the initial presentation of concurrent IgG4-related disease and systemic lupus erythematosus.

Approach:

Key Findings:

• Purpura was the initial manifestation of concurrent IgG4-related disease and systemic lupus erythematosus.
• The patient exhibited significant renal pathological overlap characterized by IgG4-related tubulointerstitial injury and lupus-induced mesangioproliferative glomerulonephritis.
• Treatment led to resolution of purpura and negative urine protein testing.

Interpretation:

Limitations:

• The study is based on a single case report, limiting generalizability.
• Long-term outcomes beyond the 8-month follow-up are not reported.

Conclusion:

Attribution Notice

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