# Beyond the Flare: A Case of Systemic Lupus Erythematosus Complicated by Hemophagocytic Lymphohistiocytosis

## TL;DR

This case study describes a rare and deadly complication of lupus called hemophagocytic lymphohistiocytosis, emphasizing the need for early diagnosis and treatment.

## Contribution

The paper presents a clinical case highlighting the diagnostic challenges and outcomes of SLE-associated HLH.

## Key findings

- The patient's condition was initially misdiagnosed as a lupus flare but was later confirmed as HLH.
- Despite treatment, the patient died from HLH-related complications.
- Early recognition and targeted therapy are crucial for improving outcomes in SLE patients with HLH.

## Abstract

Hemophagocytic lymphohistiocytosis (HLH) is a rare, potentially fatal hyperinflammatory syndrome marked by excessive immune activation, cytokine storm, multiorgan failure, and high mortality. Systemic lupus erythematosus (SLE) is considered to be one of the triggers. SLE-associated HLH is especially challenging to diagnose and manage, as it can mimic lupus flares. We describe a 30‑year‑old woman with SLE who developed secondary HLH. Initially thought to have an SLE flare, she rapidly deteriorated with multiorgan dysfunction. The diagnosis of HLH was confirmed using the HLH-2004 criteria and a significantly elevated H-score. Despite intensive treatment with corticosteroids and immunosuppressive agents, the patient ultimately died from HLH-related complications. This case highlights the critical need for early recognition and prompt differentiation of HLH from lupus flares in SLE patients. Timely, targeted therapy is essential to improve outcomes in this high-risk group.