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TABLE 1: MR imaging scoring system
Watershed area involvement 
 Absent 0
 Possible signs of infarction (mild swelling or mild signal changes) 1
 Definite signs of infarct 
  In the anterior or posterior boundary zones 2
  In the anterior and posterior boundary zones or diffuse unilateral 3
  Diffuse bilateral 4
Basal ganglia involvement 
 Absent 0
 Possible signs of infarction (fuzzy margins, swelling, mild diffuse signal changes or peripheral signal changes) 1
 Definite signal changes 
  One of the basal ganglion 2
  Two of the basal ganglia 3
  Three or more basal ganglia (globus pallidus and putamen were considered together as lentiform nuclei) 4
Theoretic maximum 8
 (Score of 8 was also attributed for signs of cerebral herniation)

Watershed area involvement
Absent	0
Possible signs of infarction (mild swelling or mild signal changes)	1
Definite signs of infarct
In the anterior or posterior boundary zones	2
In the anterior and posterior boundary zones or diffuse unilateral	3
Diffuse bilateral	4
Basal ganglia involvement
Absent	0
Possible signs of infarction (fuzzy margins, swelling, mild diffuse signal changes or peripheral signal changes)	1
Definite signal changes
One of the basal ganglion	2
Two of the basal ganglia	3
Three or more basal ganglia (globus pallidus and putamen were considered together as lentiform nuclei)	4
Theoretic maximum	8
(Score of 8 was also attributed for signs of cerebral herniation)