Table 3. Congenital arterial variants.
| A1-segment | AComA | PComA | SCA | AICA | PICA | VA | |||||||
| L | R | L | R | L | R | L | R | L | R | L | R | ||
| Group 1 | 1 | 2 | 0 | 7 | 5 | 0 | 0 | 4 | 3 | 0 | 0 | 1 | 0 |
| Group 2 | 0 | 1 | 0 | 5 | 7 | 0 | 0 | 2 | 3 | 2 | 1 | 0 | 0 |
| Group 3 | 2 | 0 | 4 | 7 | 9 | 1 | 1 | 8 | 9 | 3 | 4 | 0 | 0 |
| Control 1 | 0 | 2 | 6 | 10 | 6 | 0 | 0 | 6 | 8 | 2 | 3 | 0 | 1 |
| Control 2 | 1 | 2 | 5 | 9 | 4 | 0 | 0 | 9 | 9 | 5 | 6 | 0 | 0 |
| Control 3 | 0 | 0 | 2 | 8 | 7 | 0 | 0 | 5 | 2 | 2 | 1 | 0 | 0 |
Data are given as total number of patients per group with arterial aplasia or marked hypoplasia. Data are subdivided by side of location of aplasia/hypoplasia. L – left side, R – right side.