Diagnostic utility of cerebrospinal fluid IgG index, 24-hour IgG synthesis rate, and immunophenotyping in primary central nervous system large B-cell lymphoma: A case report

This case demonstrates the potential of integrating CSF IgG index, 24-hour IgG synthesis rate, and immunophenotyping as reliable, noninvasive diagnostic tools for the early detection of PCNS-LBCL, especially when imaging findings are inconclusive. The approach may offer valuable insights for improving diagnostic accuracy in clinical practice.