Differentiating neurosarcoidosis from multiple sclerosis using combined analysis of basic CSF parameters and MRZ...

Area of Science:

• Neurology
• Immunology
• Diagnostic Medicine

Background:

• Neurosarcoidosis is a critical differential diagnosis for multiple sclerosis (MS).
• Current diagnostic criteria often necessitate a central nervous system (CNS) biopsy.
• Distinguishing these conditions without invasive procedures is clinically significant.

Purpose of the Study:

• To evaluate the diagnostic utility of basic cerebrospinal fluid (CSF) parameters in differentiating neurosarcoidosis from MS.
• To assess if CSF analysis can obviate the need for CNS biopsy in neurosarcoidosis diagnosis.

Main Methods:

• Retrospective analysis of 27 neurosarcoidosis and 138 MS patients.
• Comparison of CSF white cell count (WCC), CSF/serum albumin quotient (Qalb), oligoclonal bands (OCB), MRZ reaction, and CSF lactate levels.
• Assessment of inflammatory biomarkers including soluble interleukin-2 receptor (sIL-2R).

Main Results:

• Neurosarcoidosis patients showed higher CSF WCC (>30/μl), increased Qalb, and elevated CSF lactate and sIL-2R compared to MS patients.
• CSF-specific OCB and positive MRZ reaction were less frequent in neurosarcoidosis.
• A combination of elevated CSF WCC or Qalb or absent OCB, along with a negative MRZ reaction, achieved high diagnostic accuracy (>92% sensitivity and specificity).

Conclusions:

• Basic CSF parameters and MRZ reaction are powerful tools for differentiating neurosarcoidosis from MS.
• Elevated Qalb, moderate-to-severe pleocytosis, and absence of intrathecal IgG synthesis are key rule-in indicators for neurosarcoidosis.
• A positive MRZ reaction serves as a valuable rule-out parameter for neurosarcoidosis.