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Epidural Abscess

Epidural Abscess


An epidural abscess is a walled off area of infection in the epidural space. This is the space between the outermost membrane of the brain or spinal cord and the overlying bone and ligaments.

What is going on in the body?

An epidural abscess is usually caused by the spread of infection from elsewhere in the body. The infection may spread either directly or through the bloodstream.


What are the causes and risks of the infection?

An epidural abscess usually results from the spread of infection either directly or through the bloodstream. For example, an infection of the nasal sinuses or an open skull fracture can cause an abscess to develop. Factors that increase a person's risk for an abscess include:
  • bacterial endocarditis, an infection of the heart
  • an implant, such as a pacemaker, that has become infected
  • an infected urinary catheter or intravenous line (IV)
  • osteomyelitis, or bone infection, especially in the vertebrae of the spine
  • a recent sinus infection
  • recent surgery
  • a tooth abscess
  • an upper respiratory infection
  • a urinary tract infection
  • a weakened immune system as a result of diabetes, HIV, or other immunodeficiency disorders


What can be done to prevent the infection?

Some epidural abscesses can be prevented by effective treatment of the infection that causes it. For example, someone with a sinus infection should finish all prescribed antibiotics.


How is the infection diagnosed?

Diagnosis of an epidural abscess begins with a history and physical exam. It may be confirmed with a cranial CT scan or cranial MRI .

Long Term Effects

What are the long-term effects of the infection?

If the abscess is small and promptly treated, the person may have no long-term effects. If there is extensive damage to the brain, the person may have cognitive impairments, motor impairments, or other problems.
If untreated, epidural abscesses may continue to grow. This can put pressure on the surrounding nerves, causing them to lose function. It may also cause the abscess to rupture, spilling its contents into the bloodstream. By one means or another, the result of an untreated abscess is often death.

Other Risks

What are the risks to others?

An epidural abscess is not contagious, and poses no risk to others.


What are the treatments for the infection?

Someone with an epidural abscess will be given antibiotics to treat the infection. Surgery is usually performed to remove the infected tissue from the brain or spinal cord.

Side Effects

What are the side effects of the treatments?

Antibiotics may cause rash, stomach upset, or allergic reactions. Surgery may be complicated by bleeding, infection, or a reaction to the anesthetic. Surgery may actually spread the infection if all of the infectious organisms are not removed or destroyed.

After Treatment

What happens after treatment for the infection?

Recurrent infections may occur if the original source of infection is not completely eliminated. If any infection is noted, it should be identified and treated appropriately. If the person has any impairment from brain damage, he or she may need speech therapy, physical therapy, or occupational therapy.


How is the infection monitored?

If there has been significant brain damage, the person may need regular visits to the healthcare professional, to whom any new or worsening symptoms should be reported.

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