TABLE 2.

Results of the investigation performed

Infectious screening
CSF	Negative: CSF bacterial, mycobacterial and fungal cultures; VDRL; TPHA; Wright test; PCR screening for viral meningitis (Herpes simplex 1; Herpes simplex 2; Varicela‐zoster; Enterovirus; Parechovirus; Adenovirus); PCR for bacterial meningitis (Neisseria meningitidis; Haemophilus influenzae; Haemophilus influenzae B; Streptococcus pneumoniae); PCR for zoonosis (Anaplasma phagocytophilum; Ehrlichia chaffeensis, E. muris; Borrelia burgdorferi s. l., B. miyamotoi, B. hermsii; Coxiella burnetii; Babesia microti, Babesia divergens; Rickettsia spp; tick‐borne encephalitis virus); borrelia anti‐bodies; CMV; Mycobacterium tuberculosis DNA
	Normal values: ADA
Serum	Negative: Blood cultures, Wright test; rose bengal; serologies for HIV, Hepatitis B and C; borrelia anti‐bodies; PCR for zoonosis (Anaplasma phagocytophilum; Ehrlichia chaffeensis, E. muris; Borrelia burgdorferi s. l., B. miyamotoi, B. hermsii; Coxiella burnetii; Babesia microti, Babesia divergens; Rickettsia spp; tick‐borne encephalitis virus); Herpes silplex 1 and 2 DNA
Auto‐imune/inflamatory/Paraneoplasic
Serum	Negative: Indirect imunoflurescence for ANAS and ANCAS; lupic anti‐coagulant; antibodies anti: cadiolipin; Beta‐2 glycoprotein; MPO; PR3; Mi; Ku; RNP; Sm; SSA; Ro 52; SSB; Scl 70; PM‐Scl; Jo‐1; CENP B; PCNA; dsDNA; nucleossomes; histones; ribossome P, M2; DFS 70); thyroglobulin; thyroid peroxidase.
	Negative anti‐neuronal antibodies (Yo (PCA‐1); Hu (ANNA‐1); Ri (ANNA‐2); Tr (DNER); GAD65; zic4 Titin; SOX1; Recoverin; PNMA2 (Ma2/Ta); CV2/CRMP5; amphiphysin; NMDA)
	Normal: ACE; Erytocyte sedimentation rate
CSF	Negative: Olygoclonal bands; Antineuronal antibodies (NMDA; LGI1; CASPR2; AMPA receptors; GABAb and GABAa; VGKC)
Metabolic
Serum	Normal values: Vitamine B12; folic acid; Thyroid hormones
Neoplasic
Serum	Normal values: b‐HCG; Beta‐2 microglobulin
Imaging	Mamography, mamary ecography and pelvic ecography were normal.