Table 2 Incidence of anatomical variations at the intracranial segment (V4) of the VA grouped according to race in South African patients.
Type of Variation | Total number of patients (incidence%) | Race | ||
|---|---|---|---|---|
Black | Indian | White | ||
Left/Right/Bilateral | Left/Right/Bilateral | Left/Right/Bilateral | ||
Hypoplasia | 89 (16.1) | 5/5/1 | 10/19/3 | 21/22/3 |
Hypoplastic terminal VA | 73 (13.2) | 9/3/0 | 8/15/0 | 20/18/0 |
VA terminating as PICA (Atresia) | 37 (6.7) | 1/2/0 | 4/9/0 | 10/11/0 |
Fenestration | 2 (0.4) | 0 | 0 | 0/1/1 |
Duplicate PICA origin | 1 (0.2) | 0 | 0 | 0/1/0 |
