Skip to main content

Advertisement

Table 1 Comparison of the variations of the CW

From: Types of the cerebral arterial circle (circle of Willis) in a Sri Lankan Population

  Author Riggs and Rupp 1963,[2] El Khamlichi et al., 1985, [16] Fisher 1965,[17] Lazorthes et al., 1979,[18] Eftekhar et al., 2006,[19] Present study
  Country USA (1) Morocco USA (2) France Iran Sri Lanka
  Total brains 994 100 414 200 102b 225
Types Configuration       
1 Typical 192(19) 18(18) 20(5) 29(14.5) 29(28) 32(14)
2 all segments hypoplastic 54(5) 0(0) 0(0) 10(5) 0(0) 0(0)
3 hypoplastic AcoA 91(9) 11(11) 6(1) 9(4.5) 0(0) 32(14)
4 Unilateral hypoplastic PcoA 88(9) 14(14) 24(6) 28(14) 20(20) 26(11.5)
5 Unilateral hypoplastic PcoA and AcoA 41(4) 6(6) 12(3) 10(5) 4(4) 15(7)
6 Bilateral hypoplastic PcoAs; 126(13) 24(24) 131(32) 44(22) 28(27) 52(23)
7 Bilateral hypoplastic PcoAs and hypoplastic AcoA 67(7) 10(10) 58(14) 34(17) 4(4) 37(16)
8 hypoplastic A1 38(5) 2(2) 0(0) 3(1.5) 0(0) 6 (3)
9 Unilateral hypoplastic P1 47(5) 3(3) 4(0.9) 5(2.5) 1(0.9) 2(0.8)
10 Bilateral hypoplastic P1s 33(3) 1(1) 16(4) 6(3) 0(0) 1(0.4)
11 hypoplastic P1 and contralateral A1 2(0.2) 0(0) 10(2) 0(0) 0(0) 0(0)
12 hypoplastic P1 and ipsilateral A1 20(2) 1(1) 1(0.2) 3(1.5) 1(0.9) 4 (2)
13 Bilateral hypoplastic P1s and A1 5(0.5) 0(0) 3(0.7) 1(0.5) 0(0) 1(0.4)
14 hypoplastic A1 and contralateral PcoA 7(0.7) 0(0) 1(0.2) 1(0.5) 0(0) 0(0)
15 Hypoplastic AcoA and P1 35(3.5) 4(4) 0(0) 4(2) 1(0.9) 6(3)
16 hypoplastic PcoA, ipsilateral A1 and AcoA 16(2) 3(3) 2(0.4) 2(1) 0(0) 0(0)
17 hypoplastic PcoA and contralateral P1 26(3) 0(0) 46(11) 3(1.5) 2(2) 1(0.4)
18 A1 and bilateral hypoplastic PcoAs 58(6) 0(0) 21(5.0) 6(3) 0(0) 4(2)
19 hypoplastic PcoA, AcoA and contralateral P1 17(2) 1(1) 28(7) 1(0.5) 1(0.9) 0(0)
20 hypoplastic P1, contralateral PcoA and ipsilateral A1 10(1) 1(1) 5(1) 0(0) 0(0) 0(0)
21 Bilateral hypoplastic P1s and AcoA 13(1) 0(0) 10(2) 1(0.5) 0(0) 1(0.4)
22 hypoplastic PcoA, ipsilateral A1 and contralateral P1 3(0.3) 0(0) 8(2) 0(0) 0(0) 0(0)
Others   5(0.5) 1(1) 8(2) 0(0) 1(0.9) 5(2)
  1. (a) Column percentages are given in parentheses. (b) Eftekhar et al. 2006[19] report the total in their study as 102 but findings are reported only for 92.