Histiocytic necrotising lymphadenitis identical to Kikuchi-Fujimoto disease in CNS lupus

Description 

A 36-year-old woman presented after a first generalised tonic–clonic seizure. On clinical examination, prominent cervical and axillary lymphadenopathy was noted. Brain MRI showed diffuse, partially enhancing, hyperintense lesions (figure 1). An axillary lymph node biopsy revealed typical findings of histiocytic necrotising lymphadenitis, compatible with Kikuchi-Fujimoto disease (figure 2).1 Laboratory studies showed positive antinuclear antibodies, low complement levels and pancytopenia. In the cerebrospinal fluid (CSF), lymphocytic pleocytosis (34/μL), elevated lactate (3.3 mmol/L) and protein (104 mg/dL) levels were noted. Investigations for lymphoma were negative. Furthermore, negative serological and PCR findings for Epstein-Barr virus, cytomegalovirus and HIV were found. Interferon-gamma release assay and PCR for tuberculosis, along with serological investigations for toxoplasmosis and syphilis, were negative. The cytological examination of the CSF revealed activated lymphocytes and plasma cells. CSF and blood cultures remained negative. On diagnostic evidence of pericarditis and a positive history for photosensitivity and...

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