Xanthochromia refers to yellow to brownish discoloration of cerebrospinal fluid. The differential diagnoses of xanthochromia are: - acute subarachnoid hemorrhage - severe increase in bilirubin levels - pseudomonal meningitis - sentinel hemorrhage - aneurysmal leaks - acute intracerebral hemorrhage - infections - brain tumors - excessive proteins Reference: https://www.ncbi.nlm.nih.gov/books/NBK526048/ Image via: https://healthjade.net/xanthochromia/