Table 3.
Image severity index score [3].
| Parameters | Points |
|---|---|
| Number (single, multilocular, or attached to each other like a bunch of grapes = 1; score increased for every additional abscess) | |
| Solitary | 1 |
| Multiple | 2–6 |
|
| |
| Location (superficial: cerebral, cerebellar hemispheres; deep: basal ganglia, thalamus, corpus callosum, brain stem, vermis, and within ventricles; extensive or combined: both superficial and deep) | |
| Superficial | 1 |
| Deep | 2 |
| Combined | 3 |
|
| |
| Diameter (large diameter of abscess in transverse plane on CT and MRI; largest diameter of multilocular abscess is the largest diameter of the abscess taken as a whole) | |
| <2 cm | 1 |
| 2–4 cm | 2 |
| >4 cm | 3 |
|
| |
| Perilesional edema (surrounding edema observed as high signal intensity on T2 weighted MRI image or hypodensity on CT image. For multiple abscesses, highest for edema was used) | |
| Minimal (maximum thickness < radius of abscess) | 1 |
| Moderate (maximum thickness between the radius and diameter of abscess) | 2 |
| Large (maximum thickness > diameter of abscess) | 3 |
|
| |
| Midline shift (in mm) | |
| Mild (<5 mm) | 1 |
| Moderate (5–10 mm) | 2 |
| Severe (>10 mm) | 3 |