Hematological results were normal without any blast cells. A soluble IL-2 receptor was 473 U/mL in the serum (reference range: 122-496 U/mL) and 103 U/mL in the cerebrospinal fluid (CSF). Her CSF showed pleocytosis of the lymphocytes (18 × 106/L), elevated concentration of proteins (0.10 g/dL), immunoglobulins (IgG 21.8 mg/dL, IgM 1.4 mg/dL), and normal glucose concentration (64 mg/dL). Her serum was positive for rheumatoid factor (18 U/mL), anti-thyroperoxidase antibody (404 IU/mL), and anti-cardiolipin beta-2 glycoprotein I antibody (5.4 U/mL). Infectious workups were nonspecific for serum or CSF. Cytological analysis of the CSF revealed no atypical cells.