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Variations of the paramedian thalamic-mesencephalic arterial supply according to Percheron.
A, In the most common variation, there are many small perforating arteries arising from the P1 segments of the PCA.
B, The artery of Percheron is a single perforating blood vessel arising from one P1 segment.
C, The third type of variation is that of an arcade of perforating branches arising from an artery bridging the P1 segments of both PCAs.
