MR noncontrast angiography done for evaluation of patient with transient loss of consciousness.
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There is a persistent fetal caroticobasilar anastomosis on the right side just caudad to the bifurcation of basilar into P1 segment of PCA- the primitive trigeminal artery.
Also evident is the unilateral fetal origin of PCOM, wherein the right PCOM is larger in caliber than P1 segment of PCA which appears hypoplastic.