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Types of ICV branching patterns. We classified ICV tributaries into 4 types with respect to the main veins draining the basal nuclei. In type 1, only the thalamostriate vein collects blood from the basal nuclei. Types 2 and 3 are characterized by the presence of a suprathalamic or retrothalamic LDV, respectively, which receives tributaries from the striatum. In type 4, the basal vein takes an unusual course and drains the basal nuclei.
