Collapsing FSGS with Concurrent Class 2 and 3 Lupus Nephritis: A Case Report and Review of the Literature.

Lupus nephritis (LN) and the collapsing variant of focal segmental glomerulosclerosis (cFSGS) are separate histologic diagnoses that are generally thought to have separate etiologies. We describe the presentation of a 20-year-old African American female with advanced renal failure (creatinine 7.16 mg/dL), nephrotic-range proteinuria, and a 30-pound weight loss. Renal biopsy demonstrated class 2 and 3 LN as well as cFSGS. A review of the current literature demonstrates that the dual diagnosis of LN and cFSGS may not be as rare as previously understood. Whether the presence of one of these pathophysiologic processes predisposes a patient to the development of the other, or whether genetic variation increases the risk for development of both conditions, remains unclear. Currently there is no standard therapy to manage these patients, and overall renal prognosis is poor.