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McLain and Weinstein classification [35]
| Zone 1 | The spinous process to the pars and inferior facet |
| Zone 2 | The superior facet, transverse process and pedicle |
| Zone 3 | Anterior three-fourth of the vertebral body |
| Zone 4 | Posterior one-fourth of the vertebral body |
| Level A | Intraosseous |
| Level B | Extraosseous |
| Level C | Distant tumour spread |
