Infectious agents in spinal epidural abscesses.

Of 27 cases of spinal epidural abscess, 19 were caused by bacteria, 7 by Mycobacterium tuberculosis, and 1 by Echinococcus granulosus. Blunt trauma and cutaneous infections were the most frequent preceding events in bacterial cases. Tuberculous abscess was usually the sole manifestation of reactivation of dormant tuberculosis. Drug addiction, the most common cause in young adults, was associated with gram-negative infections. Whatever the infectious agent, paraparesis for longer than 4 days led to a poor outcome. Myelography was the best diagnostic test, whereas lumbar puncture and percutaneous bone biopsy offered little specific information.