Extradural Mass:
- Prolapsed/sequestrated disc
- Metastases, myeloma and lymphoma deposits
- Neurofibroma
- Neuroblastoma and ganglioneuroma
- Meningioma
- Haematoma
- Abscess
- Arachnoid cyst
Intradural Extramedullary Mass:
- Meningioma
- Neurofibroma
- Metastases
- Subdural empyema
- Neurofibroma
- Schwannoma
- Lipoma/(epi) dermoid
- Arachnoid cyst
- Veins (extramedullary AVM)
Intramedullary Mass:
- Ependymoma
- Astrocytoma
- Haemangioblastoma
- Lipoma/Epidermoid
- INtramedullary AVM
- Met/abscess = RARE