Meningitis - tuberculous
Alternative Names: Tubercular meningitis; TB meningitis
Tuberculous meningitis is an infection of the membranes covering the brain and spinal cord (meninges).
See also:
- Meningitis
- Meningitis - cryptococcal
- Meningitis - Gram-negative
- Meningitis - H. influenzae
- Meningitis - meningococcal
- Meningitis - pneumococcal
- Meningitis - staphylococcal
Causes of Meningitis - tuberculous
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:
- AIDS
- Excessive alcohol use
- Pulmonary tuberculosis
- Weakened immune system
Tuberculous meningitis is a very rare disorder in the U.S.
Meningitis - tuberculous Symptoms
The symptoms usually begin gradually, and may include:
- Fever and chills
- Mental status changes
- Nausea and vomiting
- Sensitivity to light (photophobia)
- Severe headache
- Stiff neck (meningismus)
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)
Tests and Exams
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:
- Biopsy of the brain or meninges
- Blood culture
- Chest x-ray
- CSF examination for cell count, glucose, and protein
- CT scan of the head
- Gram stain, other special stains, and culture of CSF
- Polymerase chain reaction (PCR) of CSF
- Skin test for tuberculosis (PPD)
Treatment of Meningitis - tuberculous
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.
Prognosis (Outlook)
Tuberculous meningitis is life-threatening if untreated. Long-term follow-up is needed to detect repeated infections (recurrences).
Potential Complications
- Brain damage
- Build-up of fluid between the skull and brain (subdural effusion)
- Hearing loss
- Hydrocephalus
- Seizures
When to Contact a Health Professional
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 of Meningitis - tuberculous
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.
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.
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Learn more about Meningitis - tuberculous
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.
Copyright 2012 A.D.A.M., Inc.
