| Summary: | Rationale: Late-onset systemic lupus erythematosus (SLE) represents a specific subgroup of SLE, and although there is no strict age cut-off, 50 years is commonly used as the minimum age for disease onset. In this report, we present a case of a 74-year-old male with late-onset SLE and biopsy-proven lupus nephritis (LN). Presenting concerns of the patient: A 74-year-old male was referred to the nephrology clinic with a rapidly rising creatinine from a baseline of 60 µmol/L to 176 µmol/L. His labs showed pancytopenia, a positive antinuclear antibodies (ANA), and hypocomplementemia. Diagnoses: Renal biopsy showed focal proliferative glomerulonephritis that was immune-mediated and immunofluorescence showed C3, IgM, IgA, IgG, lambda, and C1q diffuse mesangial and glomerular basement membrane staining. Together these findings were in keeping with a diagnosis of stage III LN. Interventions: Treatment included hemodialysis and induction with pulse methylprednisone and cyclophosphamide. He was then placed on the Euro-Lupus Protocol. Outcomes: One year after the diagnosis, he was off dialysis, had no signs of fluid retention or uremia, and his creatinine had stabilized at ~ 330 µmol/L. Lessons learned: To the best of our knowledge, this case represents the oldest known biopsy-confirmed case of late-onset SLE and LN. Late-onset SLE is uncommon and often overlooked as classical symptoms such as malar rash or photosensitivity may not be present. The American College of Rheumatology (ACR) guidelines for treatment of LN can be applied to these patients but physicians should be cognizant of the fact that these patients may not tolerate immunosuppressive therapy as well as younger patients.
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