Evan's index can help to identify if ventricle size is abnormal, as is seen in hydrocephalus.
Parameters:
(1) maximum distance between the anterior horns in cm
(2) maximum internal skull diameter in cm
index =
= (distance between the anterior horns) / (internal skull diameter)
|
Age
|
Mean Index (Wilk et al)
|
|
<= 12 months
|
0.263
|
|
1.01 to 3 years
|
0.253
|
|
3.01 to 6 years
|
0.247
|
|
6.01 to 9 years
|
0.248
|
|
9.01 to 12 years
|
0.250
|
|
12.01 to 15 years
|
0.252
|
|
15.01 to 18 years
|
0.251
|
