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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
Note:—uni indicates unilateral; bi, bilateral.