Table 1 Incidence of anatomical variations at the intracranial segment (V4) of the VA diagnosed by MDCTA.

From: Radiological anatomy of the intracranial vertebral artery in a select South African cohort of patients

Type of Variation

Total number of patients (incidence%)

Left/Right/Bilateral

Male/Female

Hypoplasia

89 (16.1)

36/46/7

56/33

Hypoplastic terminal VA

73 (13.2)

37/36/0

46/27

VA terminating as PICA (Atresia)

37 (6.7)

15/22/0

24/13

Fenestration

2 (0.4)

0/1/0

1/1

Duplicate PICA origin

1 (0.2)

0/1/0

0/1

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