Late-Onset Familial Systemic Lupus Erythematosus With Lupus Nephritis in an 82-Year-Old Male: A Case Report and Literature Review.

Systemic lupus erythematosus (SLE) rarely occurs in men of any age. Late-onset SLE (typically after the age of 50) presents special challenges. We report a case of SLE with renal involvement in a very old man. The patient, who was 82 years old, presented with acute kidney injury and a family history of SLE. He was diagnosed with lupus nephritis based on clinical criteria, although no renal biopsy was performed. After starting corticosteroid therapy, his condition improved markedly, with recovery of renal function and resolution of proteinuria and hematuria. The patient's case is notable for its advanced age and familial context, with a milder form of lupus compared with his relatives. Despite the absence of severe kidney damage, the patient's treatment with corticosteroids was effective, reflecting the unique and rare nature of this case.