Macrophage Activation Syndrome in a Patient with Systemic Lupus Erythematous Triggered by Tuberculous Meningitis.

Background: Hemophagocytic lymphohistiocytosis (HLH), is characterized by systemic uncontrolled inflammation resulting from immune dysregulation secondary to various triggers, including genetics, infections, autoimmune diseases, and malignancies. Macrophage activation syndrome (MAS) is an immune dysregulation phenomenon, in which an underlying rheumatological disease is present. We report a rare, interesting case of a middle-aged female, with a systemic lupus erythematosus (SLE) flare complicated by macrophage activation syndrome (MAS), in which tuberculous meningitis (TBM) was the identified trigger.

Case report: A 48-year-old female with an African ethnic background, diagnosed with SLE, presented with a 2-week history of high-grade fever, cough, and worsening arthralgia. She was initially admitted with suspected SLE flare secondary to community acquired pneumonia and was started on broad-spectrum antibiotics. Later during her hospital stay, she underwent extensive workup because of her clinical condition, as she had continuous spikes of fever, progressive cytopenia, accompanied with acute confusion state despite treatment. She was ultimately diagnosed with SLE flare complicated by MAS secondary to TBM in view of persistent fever, neuropsychiatric symptoms, hyperferritinemia and hypertriglyceridemia, supported by bone marrow aspiration findings, a tuberculosis (TB) positive contact and supporting cerebrospinal fluid analysis suggestive of TBM. She was immediately started on pulse doses of steroids and anti-tuberculosis medications in which significant clinical improvement was observed. She was discharged home, with continuity of care done at the outpatient department in addition to continuity of physical rehabilitation.

Conclusion: Given the wide range of clinical presentations and similarities between SLE and the life-threatening MAS, it is essential to maintain a high level of suspicion to establish the diagnosis and promptly start the necessary treatment to ensure better clinical and survival outcomes.

Learning points: The wide range of clinical presentation of hemophagocytic lymphohistiocytosis/macrophage activation syndrome (HLH/MAS) makes it a challenging diagnosis. Hence, a high index of suspicion is necessary to establish the diagnosis and promptly start the necessary treatment.The mainstay of treatment is the early identification and management of the underlying etiology of MAS along with high-dose glucocorticoids and other immunosuppressive therapy targeting the immune dysregulation pathway.