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Variations of the ASV–ICV junction and its relation to the foramen of Monro. There are a total of 5 venous angle types (IA, IB, IIA, IIB, III).3 Types I and II refer to the relation of the venous angle to the foramen of Monro (adjacent to or located behind, respectively), whereas types A and B differentiate the ASV located at the venous angle (anteriorly) or beyond it (posteriorly). In type III, the ASV is absent.
