| Defects of segmentation . |
|---|
Bilateral |
Block vertebra |
Unilateral |
Unilateral bar |
Unilateral bar and hemivertebra |
| Defects of segmentation . |
|---|
Bilateral |
Block vertebra |
Unilateral |
Unilateral bar |
Unilateral bar and hemivertebra |
| Defects of formation . |
|---|
Pseudarthrosis/agenesis |
Hemivertebra |
Unilateral complete failure of formation |
Fully segmented |
Semisegmented |
Incarcerated |
Unsegmented |
Wedge vertebra |
Unilateral partial failure of formation |
| Defects of formation . |
|---|
Pseudarthrosis/agenesis |
Hemivertebra |
Unilateral complete failure of formation |
Fully segmented |
Semisegmented |
Incarcerated |
Unsegmented |
Wedge vertebra |
Unilateral partial failure of formation |
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