Fig 2.

Origins of the LSAs.

A, On the anteroposterior left ICA angiogram, exact origins of the LSAs cannot be evaluated.

B, On the posterior 3D reconstructed image, separate origins of the lateral LSAs are well delineated (arrows). A duplicated MCA (arrowhead in B and C) arises just proximal to the ICA bifurcation, giving cortical branches to anterior temporal lobe. No perforators from the duplicated MCA can be identified.

C, On the superior view, destinations of the LSAs (circles) and the origin of a medial LSA (arrow) are well demonstrated. LSAs with a more lateral origin supply the more posterior areas of the central brain.