Table 1.
MRI semantic features
| MR sequence | Intensity pattern | Intensity pattern | Intensity pattern |
|---|---|---|---|
| T1WI | Hyperintense | Isointense | Hypointense |
| T2WI | Hyperintense | Isointense | Hypointense |
| FLAIR | Hyperintense | Isointense | Hypointense |
| Haemorrhage | Present | Absent | - |
| Calcification | Present | Absent | - |
| DWI | Restriction | No restriction | - |
| Cyst | Present | Absent | - |
| Necrosis | Present | Absent | - |
| Tumor margins | Well defined | Ill defined | - |
| Enhancement pattern | Homogenous | Heterogeneous | - |
| Enhancement pattern | Mild (< 25%) | Moderate (25–75%) | Severe (> 75%) |
| Tumor location | Forebrain | Brainstem | Cerebellum and fourth ventricle |
| Laterality | Right | Left | Midline |
| Oedema | < Tumor volume | = Tumor volume | > Tumor volume |
| Midline shift | Present | Absent | - |
| Hydrocephalus | Present | Absent | - |
MR: magnetic resonance; T1WI: T1 weighted image; FLAIR: fluid-attenuated inversion recovery; DWI: diffusion-weighted imaging; -: blank cell