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FIG 6. Schematic representation shows a possible new mechanism for edema along the OT in pituitary-region tumors. Right, In the normal anatomy, the PV space along the OT communicates with the adjacent subarachnoid space through a thin channel medial to the OT. Left, Tumor can block this channel with mechanical, inflammatory, or adhesive processes. The PV space retains interstitial fluid and distends along the OT (dotted area).
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