1. Vascular disease                                                                                                    
         1.1 Intracranial hemorrhage
         1.2 Aneurysm
         1.3 Vascular malformation
         1.4 Stroke

2. Trauma
         2.1 Intraaxial lesion
         2.2 Extra-axial lesion

3. Neoplasm
         3.1 Gliomas
         3.2 Meningeal and mesenchymal tumors
         3.3 Neuronal and mixed neuronal/glial tumors
         3.4 Primitive neuroectodermal tumors
         3.5 Nerve sheath tumors
         3.6 Pineal region tumors
         3.7 Tumorlike lesions
         3.8 Hematopoietic tumors
         3.9 Metastases
         3.10 Cystic lesions

4. Degenerative and white matter disease
         4.1 White matter disease
         4.2 Gray matter disease
         4.3 Basal ganglia disorders

5. Hydrocephalus
         5.1 Noncommunicatong hydrocephalus
         5.2 Communicatong hydrocephalus

6. Infection
         6.1 Bacterial infections
         6.2 Fungal infections
         6.3 Parasitic infections
         6.4 Viral infections

7. Congenital disease
         7.1 Neural tube closure defects
         7.2 Cerebral hemisphere defects
         7.3 Migration and sulcation defects
         7.4 Posterior fossa malformations
         7.5 Phakomatoses

8. Sellar and juxtasellar region
         8.1 Neoplasm
         8.2 Other

9. Spine
         9.1 Congenital lesions
         9.2 Infection
         9.3 Degenerative abnormalities
         9.4 Tumors

10. Orbit
        10.1 Neoplasm
        10.2 Other

11. Other