| Invasion score | Description |
|---|---|
| 0 | mild diffuse invasion, rather sharply delineated tumor bulk |
| 1 | mild diffuse invasion, rather sharply delineated tumor bulk with mild invasion of the corpus callosum |
| 2 | moderate to strong diffuse infiltration of one brain hemisphere |
| 3 | massive diffuse infiltration of both hemispheres, gliomatosis-like pattern |
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