The optic nerve from each eye gathers above the sella turcica to form the optic chiasm. The anatomical region of the optic chiasm is relatively complex, with the pituitary gland located inferiorly, the third ventricle superoposteriorly, the anterior cerebral artery and the anterior communicating artery superoanteriorly, and the internal carotid arteries bilaterally. The tumor, inflammation, trauma, or vascular lesions, etc. at this site may all involve the optic chiasm [1, 2].
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