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CTA MIP axial cross-sections of the ICV branching patterns. A, Normal ICV anatomy (type 1) in both the left and right hemispheres. The arrow indicates the TSV; the arrowhead, the medial atrial vein. B, The suprathalamic variants of the lateral direct vein (right hemisphere). The arrow indicates the LDV. Type 1 is present in the left hemisphere. C, The retrothalamic LDV (left hemisphere). The arrow indicates the LDV. Type 1 is shown in the right hemisphere.
