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Table 1: 

 Definitions of 3 groups for volume changes and 4 types of T2 signal changes


Changes
Group 1Decreased in volume
Group 2Unchanged in volume
Group 3Increased in volume
Type 1No changes in T2 signal intensity
Type 2Increase in T2 signal intensity
Type 3Increase in T2 signal intensity intermixed with dark signal intensity
Type 4Changed to totally dark signal intensity