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A case of failed segmentation of ventricles and subarachnoid spaces. The cerebral aqueduct, the boundary between the third and fourth ventricles, was missing (white arrowhead). The subarachnoid space at the convexity region contained some parts of the inner plate of the skull (white arrow). a Sagittal midplane, (b) sagittal section passing through the right eye center, (c) axial section in the high-convexity part
