[Three patients with tuberculous meningitis: treatment started at tentative diagnosis].

A 30-year-old man and a 37-year-old woman with no history of tuberculosis developed symptoms of headache, vomiting and subsequent aggressive behaviour. After several lumbar punctures, the PCR test for tuberculosis in the cerebrospinal fluid was positive, and a definitive diagnosis of tuberculous meningitis was made. Treatment with antimycobacterial agents was not started until a few days after hospital admission. The man recovered, but was treated for brainstem tuberculoma 12 months later; the woman died on day 11 of hospitalisation. A third patient, a 31-year-old man, was admitted to the hospital for miliary tuberculosis. He had signs of progressive apathy and meningismus. Mycobacterium tuberculosis was found in his cerebrospinal fluid. Each of these patients underwent cerebrospinal fluid drainage due to communicating hydrocephalus and each had hyponatraemia. Tuberculous meningitis is a lethal complication of tuberculosis that is often diagnosed late due to the insidious nature of its symptoms. Early treatment with antituberculous drugs and dexamethasone--even before a definitive microbiological diagnosis is made--may prevent severe neurological damage and death.