Table 2:

Overview of the tumor proposed epicenter and direction of extension

Primary Location (No. of WNT-MBs)	Extension		Further Extension		LS
Fourth ventricle (25) (66%)	Unilateral recess	n = 7	Plus uni CPA	n = 1	2
			No	n = 6	1
	Bilateral recesses	n = 16	Plus uni CPA	n = 4	1
			Plus bi CPA	n = 0	0
			No	n = 12	0
	No extension	n = 2			0
Cerebellar vermis (3) (8%)	Unilateral recess	n = 1			1
	Bilateral recesses	n = 1			0
	Fourth ventricle only	n = 1			0
	No extension	n = 0			0
CPA (5) (13%)	Unilateral recess	n = 4	Plus fourth ventricle	n = 4	2
	Bilateral recesses	n = 0			2
	No extension	n = 1			2
Deep WM (3) (8%)	Unilateral recess	n = 1	Plus uni CPA	n = 1	2
	Bilateral recesses	n = 0			2
	Fourth ventricle only	n = 1			2
	No extension	n = 1
Cerebellar hemisphere (2) (5%)	Unilateral recess	n = 2	Plus uni CPA	n = 1	2
	Bilateral recesses	n = 0			2
	Fourth ventricle only	n = 0			2
	No extension	n = 0			2