The spectrum of cerebrospinal fluid findings in tuberculous meningand their relation to severity, radiological features, and outcome

Abstract

Objectives: The aim of the study was to evaluate cerebrospinal fluid (CSF) findings in tuberculous meningitis (TBM) and correlate it with sevradiological features, and outcome of TBM. Materials and Methods: In a retrospective study, data from admitted TBM patients were analyzed, and findings of CSF examinations were recorded. The CSF was categorized as typical (protein 50–500 mg/dL, cells 50–500/mm3, and glucose 50% or lower of blood sugar); those above and below these values were categorized as increased or decreased, respectively. The CSF findings were correlated with stage of TBM, and 3-month outcome and radiological features. Paradoxical response was also noted. Results: There were 111 patients with TBM (definite 34, highly probable 77). On admission, 20 patients were in Stage I, 63 in Stage II, and 28 in Stage III TBM. CSF cells were in typical range in 73, low in 27 and increased in 11 patients. Protein was in typical range in 92 patients decreased in 11 patients and increased in eight patients. Sugar was normal in 41 and reduced in 70 patients. CSF cells, glucose, and protein did not correlate with the severity of meningitis. Fifteen patients had normal initial magnetic resonance imaging (MRI). Tuberculomas were present in 53 patients, hydrocephalus in 43 patients, basal exudates in 43 patients, and infarction in 44 patients. Mixed findings were present in 65 patients. The MRI features did not correlate with CSF. Second CSF was available after a median duration of 26 (13–276) days in 50 patients. The CSF cells were decreased in 20 and increased in 30 patients, protein increased in 30 and sugars decreased in 16 patients. Paradoxical worsening occurred in 27 patients. Fifty-one patients recovered completely, 41 partially, 15 had poor, three patients were lost to follow-up, and one died. CSF parameters did not correlate with 3-month outcome or paradoxical worsening. CSF parameters do not differ significantly between baseline and 1 month CSF, but cells and lymphocytes changed significantly between 1st month and 3rd month CSF. Conclusion: Typical CSF findings were present in 66% and did not correlate severity of TBM, radiological features paradoxical worsening or 3-montoutcome. CSF cell count decreased within 3 months of treatment.