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A bullet-shaped vertebra refers to a vertebral body with an anteriorly beaked or rounded appearance resembling a bullet or wedge.

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• Seen on lateral spine X-ray.
• Usually involves the lumbar vertebrae.

Pathogenesis

• Due to abnormal ossification or growth plate disturbance.
• Can result from congenital anomalies, dysplasia, or metabolic bone disease.

Radiological Features

• Anterior concavity/beaking of vertebral body.
• Loss of normal rectangular shape; vertebra appears rounded anteriorly.
• Often seen in multiple contiguous vertebrae.

Causes (Associations)

1. Skeletal Dysplasias

• Achondroplasia (most classic) → bullet-shaped vertebrae in lumbar spine.
• Mucopolysaccharidoses (Hurler’s, Morquio’s syndrome): Anterior vertebral beaking/bullet shape.

2. Congenital / Developmental

• Congenital vertebral anomalies (wedge vertebra, hemivertebra).

3. Other Conditions