Definitions of 3 groups for volume changes and 4 types of T2 signal changes
| Changes | |
|---|---|
| Group 1 | Decreased in volume |
| Group 2 | Unchanged in volume |
| Group 3 | Increased in volume |
| Type 1 | No changes in T2 signal intensity |
| Type 2 | Increase in T2 signal intensity |
| Type 3 | Increase in T2 signal intensity intermixed with dark signal intensity |
| Type 4 | Changed to totally dark signal intensity |