“…14,17 Variations of the PICA include absent, single trunk, duplication, fenestration and DOPICA. [17][18][19][20][21][22] Other variations include VA termination of the PICA, 23 extradural origin at the C-1 and C-2 level and origin from the hypoglossal, pro-atlantal and posterior meningeal arteries. 17,24 Among them, DOPICA is a rare anatomical variation 1,2,4,7,11,12,22,24,25 that was first described by Stopford in 1916, and that reportedly occurs in 1/150 individuals.…”