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Central nervous system
Central nervous system


Meningitis - tuberculous

Definition:

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

See also:



Alternative Names:

Tubercular meningitis; TB meningitis



Causes, incidence, and risk factors:

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

Risk factors include a history of:

Tuberculous meningitis is a very rare disorder in the U.S.



Symptoms:

The symptoms usually begin gradually, and may include:

Other symptoms that can occur with this disease:

  • Agitation
  • Bulging fontanelles
  • Decreased consciousness
  • Poor feeding or irritability in children
  • Unusual posture, with the head and neck arched backwards (opisthotonos )


Signs and tests:

Physical examination will usually show:

  • Fast heart rate
  • Fever
  • Mental status changes
  • Stiff neck

For any patient who is suspected of having meningitis, it is important to perform a lumbar puncture ("spinal tap "), in which spinal fluid (known as cerebrospinal fluid, or CSF) is collected for testing. When the health care provider suspects tuberculous meningitis, more than one CSF sample may be needed to make the diagnosis.

Tests that may be done include:



Treatment:

Treatment involves several antitubercular drugs at the same time, as it does for pulmonary tuberculosis . Treatment sometimes must begin if the diagnosis is only suspected, not proved, in order to save a person's life.

Treatment usually lasts for at least 12 months. Systemic steroids may also be used.



Support Groups:



Expectations (prognosis):

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



Complications:

Calling your health care provider:

Call the local emergency number (such as 911) or go to an emergency room if you suspect meningitis in a young child who has the following symptoms:

  • Feeding problems
  • High-pitched cry
  • Irritability
  • Persistent unexplained fever

Call the local emergency number if you develop any of the serious symptoms listed above. Meningitis can quickly become a life-threatening illness.



Prevention:

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:

Iseman MD. Tuberculosis. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 345.

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




Review Date: 9/15/2010
Reviewed 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, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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