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Native vertebral osteomyelitis with spinal epidural abscess and progressive neurologic compromise — ABIM Board

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HardOrthopedicsNative vertebral osteomyelitis with spinal epidural abscess and progressive neurologic compromiseABIM Board

A 61-year-old man with type 2 diabetes mellitus is hospitalized for fever and 2 weeks of worsening low back pain. Two sets of blood cultures grow methicillin-susceptible Staphylococcus aureus, and intravenous antimicrobial therapy is started. MRI of the lumbar spine shows L3-L4 discitis and vertebral osteomyelitis with a large ventral epidural abscess causing severe compression of the cauda equina. Six hours after admission, he develops urinary retention, saddle hypoesthesia, and bilateral ankle dorsiflexion weakness that progresses from 4/5 to 3/5. Temperature is 100.8°F (38.2°C), blood pressure is 128/74 mm Hg, and pulse is 96/min. A spine surgeon is immediately available. Which of the following is the most appropriate next management strategy?

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Correct answer: E — Immediate surgical decompression and debridement with pathogen-directed intravenous antimicrobial therapy

Explanation lettering: D = shown as A · E = shown as B · B = shown as C · A = shown as D · C = shown as E

This patient has native vertebral osteomyelitis complicated by an epidural abscess and rapidly progressive cauda equina dysfunction. New urinary retention, saddle sensory loss, and worsening bilateral weakness indicate neurologic compromise from mechanical compression; therefore, immediate surgical decompression and debridement must accompany antimicrobial therapy. Hemodynamic stability does not justify delaying decompression when neurologic deficits are progressing. An image-guided biopsy (A) is unnecessary because concordant S aureus bacteremia plus compatible MRI findings establishes the microbiologic diagnosis; when surgery is required, additional specimens can be obtained intraoperatively. Antimicrobial therapy alone (B) can be appropriate in selected patients with vertebral osteomyelitis who have a stable neurologic examination and no clinically significant compression, but it is inadequate here. Percutaneous drainage (D) may provide source control for an accessible collection in a patient without progressive neurologic compromise, but it does not reliably achieve the urgent neural decompression required for cauda equina syndrome. Operative sampling is appropriate, but withholding antimicrobial therapy (E) is not: neurologic compromise is an explicit exception to delaying treatment for culture optimization, and the bloodstream isolate already identifies the pathogen.

Reference: 2015 Clinical Practice Guidelines for the Diagnosis and Treatment of Native Vertebral Osteomyelitis in Adults (July 29, 2015) — https://www.idsociety.org/practice-guideline/vertebral-osteomyelitis/ 2015 Clinical Practice Guidelines for the Diagnosis and Treatment of Native Vertebral Osteomyelitis in Adults (July 29, 2015) — https://www.idsociety.org/practice-guideline/vertebral-osteomyelitis/ 2015 Clinical Practice Guidelines for the Diagnosis and Treatment of Native Vertebral Osteomyelitis in Adults (July 29, 2015) — https://www.idsociety.org/practice-guideline/vertebral-osteomyelitis/