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Fistulous withers causing spinal epidural abscess in a Thoroughbred mare
Serena Ceriotti1, Stuart Clark-Price1, Robert Cole1
1Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, 1220 Wire Road, 36832 Auburn, AL, USA.
Journal of Equine Veterinary Science
|September 1, 2025
Summary
A rare case of fistulous withers in a horse led to vertebral osteomyelitis and spinal epidural abscess (SEA). Early diagnosis and intervention are crucial for this severe complication in equine neurology.
Area of Science:
- Equine Medicine
- Veterinary Neurology
- Infectious Disease
Background:
- Fistulous withers is a common equine condition.
- Vertebral osteomyelitis and spinal epidural abscess (SEA) are severe complications.
- This case presents a novel progression from fistulous withers to SEA.
Observation:
- A 15-year-old Thoroughbred mare with fistulous withers developed hindlimb ataxia and paresis.
- Diagnostic imaging showed vertebral fractures and abscessation.
- Neurological decline progressed despite aggressive medical treatment.
Findings:
- Post-mortem examination confirmed an extensive paraspinal abscess extending into the epidural space.
- The abscess caused severe spinal cord compression.
- Escherichia coli, a pathogen common in fistulous withers, was isolated.
Implications:
- Spinal epidural abscess (SEA) should be considered in horses with chronic paraspinal infections and acute neurological decline.
- Early surgical intervention and targeted antimicrobial therapy are critical for improving outcomes.
- Prognosis for SEA in horses remains guarded due to diagnostic and treatment limitations.

