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FIG 4. A, Axial section of the right upper midbrain. Kluver-Barrera stain (magnification x4). Section line between ventral and dorsal halves is noted in the center. Aqueduct, periaqueductal gray matter, red nucleus, cerebral peduncle, and optic tract are demonstrated. Behind the cerebral peduncle, there is an ovoid space.
B, Magnified axial section demonstrating the PV space at the upper midbrain. H&E stain (magnification x50). The ovoid space includes a vessel (arrow) and is lined by a pial layer (arrowhead). No necrotic or ischemic changes were visible in the surrounding brain tissue in this magnified view. Histologic findings histologically a PV space (1–5).
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