Proportion of Variant Anatomy of the Circle of Willis and Association with Vascular Anomalies on Cerebral CT Angiography

Table 2

Anterior circulation variant percentage distribution.

ANTERIOR CW	FREQUENCY (IN BOTH MALE AND FEMALES)	FREQUENCY IN MALES	FREQUENCY IN FEMALES
TYPEA	78.7% (n=74)	69.8% (n=37)	90.2% (n=37)
TYPE B	0% (n=0)
TYPE C	1.1% (n=1)
TYPE D	4.3% (n=4)
TYPE E	0% (n=0)
TYPE F	0% (n=0)
TYPE G	4.3% (n=4)
TYPE H	11.7% (n=11)
TYPE I	0% (n=0)
TYPE J	0% (n=0)