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Oblique coronal view MIP (a) and posteroanterior view VR (b) computed tomography (CT) angiography images show absence of the right PICA and well-developed right AICA and left PICA in a 54-year-old man. The images also depict a dominant left vertebral artery. Thick long arrow = left PICA, thin long arrows = right and left AICAs, thick short arrows = right and left SCAs, thin short arrows = right and left PCAs, and R = right.
