Table 2:

MR imaging scoring criteria^a

Tumor Feature	Scores
Edema	None or mild (1); smaller than tumor volume (2); larger than tumor volume (3)
Mass effect	Subarachnoid space effacement (1); ventricular system compression (2); midline shift (3)
Contrast enhancement	None (1); mild or nodular (2); marked and heterogeneous (3)
Borders	Well-defined (1); poorly defined (2)
Heterogeneity	Homogeneous (1); heterogeneous on T2WI (2); heterogeneous on T1WI and T2WI (3)
Necrosis/cyst	None (1); involving less than half the volume of the tumoral mass (2); involving more than half the volume of the tumoral mass (3)
Hemorrhage	None (1); present (2)
Flow void	None (1); present (2)

^aThe numbers in parentheses are the scores assigned for the grades of tumor features.