Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Incidence of anatomical variations at the intracranial segment (V4) of the VA diagnosed by MDCTA.
| 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 |
