Table 1.

Diameters of the branches of vertebrobasilar circulation.

	Artery (mean diameter ± SD mm)
	VA	PICA	AICA	SCA	PCA
Right	2.95 ± 0.47	1.67 ± 0.45	1.24 ± 0.38	1.59 ± 0.39	2.56 ± 0.43
Left	3.23 ± 0.57	1.64 ± 0.37	1.28 ± 0.42	1.52 ± 0.31	2.43 ± 0.34
Total	3.08 ± 0.53	1.66 ± 0.53	1.26 ± 0.43	1.56 ± 0.44	2.52 ± 0.36

VA: vertebral artery, PICA: posterior inferior cerebellar artery, AICA: anterior inferior cerebellar artery, SCA: superior cerebellar artery, and PCA: posterior cerebral artery.