| Value | Code Name | Code | Code System | Code Description |
|---|---|---|---|---|
| Focal | Focal | Involves less than half of one lobe | ||
| Lobar | Lobar | Involves more than half of one lobe | ||
| Multilobar | Multilobar | Involves multiple lobes | ||
| Hemispheric | Hemispheric | Involves an entire supratentorial hemisphere | ||
| Bihemispheric | Bihemispheric | Involves both hemispheres | ||
| Posterior fossa | Posterior fossa | Involves the cerebellum and/or brainstem | ||
| Global | Global | Involves the entire brain |