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Fig 3. A 51-year-old man with intermittent dizziness. A, DSA, left VA injection, anteroposterior view, showing disease in the distal VA and proximal BA (arrowhead), including faint opacification of the right AICA (arrow). B, DSA, left common carotid artery injection, lateral view, showing a large PcomA supplying the BA. Note that the PcomA then continues as the left PCA (arrowhead). The hemispheric branch of the right PICA territory is fed through a connection with the BA. C, DSA, left common carotid injection, transfascial view, showing a large left PcomA supplying the BA and continuing its course as the left PCA. Note the opacification of the right AICA (arrow), which confirms the existence of a connection between the left VA and the distal BA.
