Imaging of spine infection.

[pyomyositis]

This article reviews the imaging and relevant clinical details of infection of the extradural spine . Spine infections are increasing in incidence and in frequency of diagnosis . They are clinically important despite their relative rarity , because they may be life-threatening , and because early diagnosis leads to improved outcomes . The focus is on pyogenic spondylodiscitis . The also typically pyogenic conditions of epidural and subdural abscess , facet joint infection , and pyomyositis are discussed . Nonpyogenic , granulomatous infections are also addressed . Magnetic resonance imaging is emphasized . The radiologist 's role in performing minimally invasive sampling procedures is highlighted .