“…However, when CSF eosinophilia is present, it may be an indicator of an underlying pathology associated with, or possible cause of shunt malfunction. In patients presenting with concern of shunt malfunction in the setting of elevated CSF eosinophil count, clinicians should consider workup of infection, benign underlying inflammatory reaction, or both [1,2,4,6,7,9,10,[12][13][14]18]. CSF eosinophilia has been reported in association with infection such as parasitic, bacterial, or mycotic infection of the central nervous system [1,7,9,12,13,15,16,19].…”