Unfused spinous process
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At the time the article was created Anon Ny Mous had no recorded disclosures.View Anon Ny Mous's current disclosures
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This should be differentiated from accessory ossicles of the spinous process, which appear after non-fusion of the secondary ossification center (or centers in bifid spinous processes). These appear as a well-corticated fragment adjacent to the tip of the spinous process with a vertical or near-vertical lucency.
The importance lies in patients with potentially traumatic spinal injuries, in which it is important to identify this variant and avoid potential pitfall of diagnosing a fracture. A well-defined cortical margin is a helpful clue.