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Meningitis - tuberculous

Contents of this page:

Illustrations

Central nervous system
Central nervous system

Alternative Names    Return to top

Tubercular meningitis; TB meningitis

Definition    Return to top

Tuberculous meningitis is an infection of the the membranes covering the brain and spinal cord (meninges).

See also:

Causes    Return to top

Tuberculous meningitis is caused by Mycobacterium tuberculosis, the bacteria that causes tuberculosis. The bacteria spreads to the brain from another site in the body.

Risk factors include a history of:

Tuberculous meningitis is a very rare disorder.

Symptoms    Return to top

The symptoms usually begin gradually, and may include:

Exams and Tests    Return to top

For any patient with meningitis, it is important to perform a lumbar puncture ("spinal tap"), in which doctors take a sample of spinal fluid (known as cerebrospinal fluid, or CSF) and send it for lab tests.

When the health care provider suspects tuberculosis, there may be a need to get many CSF samples over time to increase the chance of a diagnosis. This may require many lumbar punctures.

The following tests help diagnose tuberculous meningitis:

Treatment    Return to top

Treatment involves several antitubercular drugs at the same time, as it does for pulmonary tuberculosis. Treatment usually lasts for at least 12 months. Systemic steroids may also be used.

Outlook (Prognosis)    Return to top

Tuberculous meningitis is life-threatening if untreated. Long-term follow-up is needed to detect repeated infections (recurrences).

Possible Complications    Return to top

Brain damage resulting from the infection may cause:

When to Contact a Medical Professional    Return to top

Go to the emergency room or call 911 if you suspect you or your child may have any form of meningitis. This condition can rapidly cause disability or death.

Call your health care provider if symptoms worsen or do not improve with treatment, or if new symptoms develop.

Prevention    Return to top

In areas where tuberculosis is more common, the BCG vaccine may help prevent severe forms of tuberculosis, such as meningitis, in very young children.

Treating people who have evidence of a non-active (dormant) tuberculosis infection can prevent the spread of tuberculosis. A dormant infection can be detected by a positive PPD.

References    Return to top

Swartz MN. Meningitis: bacterial, viral, and other. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 437.

Update Date: 9/28/2008

Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, University of Washington School of Medicine; and Jatin M. Vyas, PhD, MD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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