Abstract
This letter to the editor highlights adding the diagnostic utility of immunoglobulin G4 (IgG4) measurements and its potential role in IgG4-related spinal pachymeningitis (IgG4-RSP) pathogenesis to the case reported by Chae TS et al, which focused on IgG4-RSP diagnosis based on magnetic resonance imaging findings and increased plasma IgG4 concentrations. A comprehensive understanding of both IgG4 serological and cerebrospinal fluid biomarkers is essential for managing this complex condition.