This is a prospective study involving all patients treated at the University of Kentucky for spinal epidural abscess over a 2-year period. Based on ongoing referrals of patients with SEA, we expect that 200 patients will be enrolled during this time window. We propose to study all available clinical, pathological, radiological, and socioeconomic data of patients diagnosed with a spinal infection with or without a history of drug abuse over this study period. All patients' charts will be prospectively reviewed starting at the time of presentation for a period of 1 year.