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Vacuum Phenomenon

  • Spondylosis deformans Anulus fibrosis
  • Schmorls node Intervertebral disc within vertebral body
  • Intraspinal disc herniation Intervertebral disc within spinal canal or epidural space
  • Osteoarthritis Apophyseal joint
  • Ischaemic necrosis Vertebral body

Vacuum phenomena are a characteristic, although not pathognomonic, sign of intervertebral (osteo)chondrosis.

When isolated in the outer portions of the anulus fibrosus the vacuum phenomenon represents early findings of Spondylosis deformans. Similar gaseous collections have been noted in the discs of the cervical spine after trauma. Displacement or herniation of portions of a degenerating intervertebral disc into the spinal canal can also be associated with gas formation in both the disc and the canal.

An intraosseous vacuum phenonemon may occur after fracture and fragmentation of vertebrae in patients with Ischaemic necrosis, particularly those taking steroid medications.