Table 2.

Parameters employed for the analytic qualitative approach (Algorithm 2)

Site	Supratentorial or infratentorial
Sequence	Parameters
T1-weighted post-contrast	Axial dimensions of the enhancing lesion (in mm)
	Shape of the enhancing lesion (regular, partly irregular, irregular)
	Margins of the enhancing lesion (regular, partly irregular, irregular)
	The enhancing lesion involves extensively the cortex?
T2-weighted on various planes	Axial dimensions of the high signal region surrounding the enhancing lesion (mm)
	Margins of the signal alteration corresponding to the enhancing lesion (regular, partly irregular, irregular)
	Are there prominent blood vessels passing through the lesion?
	Is there any abnormal signal and/or thickening of the cortex outside of the area corresponding to the enhancing region?
	Are there low T2 signal alterations in the peri-enhancing region?
FLAIR	Is there any abnormal signal and/or thickening of the cortex outside of the area corresponding to the enhancing region?