[Unclear neurological condition and fever].

We report two cases of elderly patients who developed an unclear neurological condition with fever. The CSF findings showed a predominantly mononuclear pleocytosis, low glucose in relation to serum glucose and elevated protein. This liquor constellation led to the suspicion of tuberculous meningitis. PCR and finally CSF culture confirmed the diagnosis, which is often delayed because of nonspecific clinical findings. The characteristic CSF formula should lead to rapid antituberculous treatment, as mortality is high.