Anatomical Variations of the Circulus Arteriosus in Cadaveric Human Brains

Table 6

Comparison of morphological variations of ACoA in percentage.

Variation type	Present study	Kwak et al. [20]	Saidi et al. [21]	Baptista [22]	Kanemoto et al. [23]	Zhao et al. [24]	Uchino et al. [25]	de Almeida [26]	Perlmutter and Rhoton [27]	Gomes et al. [28]
Absent	8	—	—	—	—	—	—	—	—	—
Hypoplastic	10	—	—	—	—	—	—	—	—	—
Double	10.66	—	14	—	—	—	—	18	30	43.3
Fenestrations	3.33	—	2.6	—	—	0.8	1.2	—	—	—
3rd A2 seen	3.33	—	—	—	—	—	—	—	—	—
Aneurysm	8	5.7	—	13	13	—	—	—	—	—