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Left: Big lateral tentorial artery which anatomically runs along the lateral edge of the tentorium cerebelli towards the sigmoid sinus. In this particular case, we see several small branches with lateral directions. Angiographically this artery shows a downward course in the lateral projection.
Right: Big medial tentorial artery (also known as artery of Bernasconi and Cassinari) which runs along the medial (free) edge of the tentorium towards the confluence of sinuses), angiographically it shows an upward course in the lateral projection and stays near the midline in the ap projection.