Fig. 4.

(A) Digital subtraction angiogram, selective vertebral artery (VA) injection, anteroposterior view. A microcatheter injection at the left VA show fillings of both VA’s, the ventral spinal artery, and the basilar artery (BA) and the Circle of Willis (CoW). (B) Roadmap image of the Echelon 10 microcatheter advanced from the Ramus Spinalis to the Ventral Spinal artery and resultant artery straightening secondary to microcatheter stiffness. (C) microcatheter injection in the proximal left P1 segment demonstrating Echelon 10 microcatheter in the cerebral circulation but with significant straightening of the basilar artery. MCA, middle cerebral artery; ACA, anterior cerebral artery; PCoA, posterior communicating artery; SCA, superior cerebellar artery; PCA, posterior cerebral artery.