In patients with tuberculous meningitis, the cerebrospinal fluid pressure may appear elevated, with a clear appearance. In some patients, the cerebrospinal fluid may be yellowish or have hairy glass-like changes, and a fibrous film may appear after a few hours of placement, facilitating the diagnosis of tuberculous meningitis. In addition, cerebrospinal fluid cytology may show an increased cell count. Biochemical examination of the cerebrospinal fluid may show increased cerebrospinal fluid protein and decreased sugar and chloride. Currently, sequencing of the Mycobacterium tuberculosis gene in the cerebrospinal fluid can provide additional opportunities for detection.