Pseudovacuum of the cervical intervertebral disc: a normal variant

Area of Science:

• Radiology
• Anatomy
• Orthopedics

Background:

• Intervertebral disc injuries are often identified by vacuum signs on radiographic imaging.
• Differentiating true vacuum signs from normal anatomical variants is crucial for accurate diagnosis.

Observation:

• A lucency at the superior margin of the intervertebral disc space, known as the Mach band phenomenon, was observed.
• This finding can be mistaken for a true vacuum sign, indicative of disc injury.

Findings:

• The pseudovacuum sign, related to the Mach band phenomenon, was present in 65% of adult and 50% of child subjects.
• Patients exhibiting the pseudovacuum sign showed no radiographic evidence of intervertebral disc injury.

Implications:

• Recognizing the Mach band phenomenon as a normal variant can prevent misdiagnosis of intervertebral disc injury.
• This understanding aids radiologists and clinicians in interpreting spinal imaging more accurately.
• Further research may refine imaging criteria for differentiating normal variants from pathological findings in the spine.