Primary Sjögren's syndrome or multiple sclerosis? Our experience concerning the dilemma of clinically isolated syndrome.

: The authors present the case of a 50 years old woman who during 3 years had a transient right limbs palsy, and numerous episodes of unilateral/bilateral optic neuropathy. The CSF and MRI examinations did not sustain the diagnosis of multiple sclerosis (MS). After 2 years from the onset, she presented bilateral trigeminal neuropathy, and after 9 months the anti-SS-A and anti SS-B antibodies were positive. The sialography and the minor salivary ducts biopsy (in the absence of xerostomia and xerophthalmia) have established the diagnosis of primary Sjogren's syndrome (pSS). Subsequently, the patient presented spastic paraparesis, the clinical and imagistical features have suggested the diagnosis of acute transverse myelitis C4-T4. The treatment administered (corticosteroids and IGIV) improved the clinical state. The authors analyse then cases with SLE and cases with pSS, whose initial diagnosis was MS possibly with no evidence of collagen tissue disorders (CD) for many years. In conclusion, screening for biomarkers of SLE or pSS should be systematically performed in a case of acute or chronic myelopathy. Some laboratory tests as CSF examination, the antibodies type, cranial and spinal MRI, are useful for the differential diagnosis with MS. In a neurological clinically isolated syndrome (CIS) the diagnosis of MS should be precautiously established; the close follow-up of patients is always necessary, those with atypical neurological symptoms for MS, relapsing-remitting form, or lack of response to the common treatment for MS, should be examined for CD.