Table 1. Cerebrospinal Fluid Parameters with Results.

CNS: central nervous system; RBCs: red blood cells; WBCs: white blood cells

Cerebrospinal Fluid Parameters	Results
Macroscopic Appearance	Clear colourless fluid
Gram Stain	Bacteria not seen
WBCs	544 per microliter
RBC’s	52 per microliter
Polymorphs	5%
Lymphocytes	95%
Culture	No growth after extended incubation
Cellular Pathology	An abundance of lymphoid cells with many larger atypical forms in keeping with lymphoma involving CNS
Flow Cytometry	78% of total events as kappa light chain restricted B cells which express CD10, strong CD38, weak CD43, CD79b, and CD81. These cells do not express CD5, CD20, CD22, CD23, or CD200