N euro-Sweet disease (NSD) should be considered in the differential diagnosis of recurrent aseptic meningoencephalitis; a thorough skin examination and early skin biopsy can facilitate diagnosis and early treatment for this steroidresponsive condition.
Case reportA 49-year-old African American woman developed acute confusion followed by speech arrest, right face and arm weakness, and hemineglect that spontaneously resolved 1 hour from onset. Brain MRI showed fluid-attenuated inversion recovery (FLAIR) hyperintensities and cortical thickening in bilateral cingulate gyri and left insular and frontal cortex (figure 1, A and B). Her examination showed a Montreal Cognitive Assessment (MoCA) score of 8/30. CSF showed 327 nucleated cells/mL (lymphocyte predominant) and protein 120 mg/dL. Erythrocyte sedimentation rate (ESR) was 36 mm/h, C-reactive protein (CRP) 5.3 mg/L, peripheral leukocyte count 14.3 K/mm 3 with 67% neutrophils. No infectious etiology was identified. Pertinent negatives included the following: CSF and serum paraneoplastic panel; CSF herpes simplex virus, cytomegalovirus, and varicella-zoster virus PCRs, and West Nile virus immunoglobulin M; CSF and serum protein electrophoresis; and serum thyroidstimulating hormone, TPO antibody, HIV, rapid plasma reagin, antinuclear antibodies, extractable nuclear antigen, and antineutrophil cytoplasmic antibodies. CSF cytology and body PET/CT demonstrated no malignancy. EEG showed left hemispheric slowing. Levetiracetam was started given the presenting transient deficits. After 5 g of IV methylprednisolone (empiric treatment for presumed autoimmune encephalitis), she was discharged on oral prednisone with an improved MoCA score of 18.The patient was readmitted 11 days later with transient confusion and fevers to 39.5°C after errantly tapering her prednisone off within 1 week of discharge. A 1 cm erythematous papule was noted above her lip. A repeat EEG was normal; repeat brain MRI and CSF analysis showed interval improvement. Oral prednisone was restarted. In clinic on the last day of her planned steroid taper, she was doing well, but memory, language, and executive dysfunction persisted (MoCA 16). Brain MRI showed resolution of the FLAIR changes (figure 1, C and D). Her skin lesion had disappeared. Because of a mild headache and depressed mood, venlafaxine was started.A week later, the patient re-presented with a temperature of 39.1°C and no identifiable infectious etiology; however, tender, edematous violaceous papules had erupted over all her limbs and abdomen (figure 2, A and B). Her neurologic examination was unchanged. Venlafaxine was stopped with concern for a drug allergy. ESR was 73 mm/h. A skin biopsy revealed dermal neutrophilic infiltration and septal panniculitis without vasculitis, diagnostic of Sweet syndrome (figure 2, C and D). The rash cleared with
Practical ImplicationsNeuro-Sweet disease should be considered in the differential diagnosis of recurrent aseptic meningoencephalitis; a thorough skin examination and early skin biopsy can facilitate di...