Involvement of the optic chiasm from its inferior surface occurs with fair frequency owing to the high incidence of pituitary neoplasms. Involvement of the optic chiasm from its superior surface, that is, from impingement on it by lesions proceeding from the floor of the third ventricle, occurs less frequently, while actual invasion of the chiasm is extremely rare. The present report presents a case of a neoplasm extending into the substance of the optic chiasm.
Recently there was reported a case of an extensive glioma of the third ventricle,1 serial sections of which showed that the sheath of the optic nerve and optic chiasm had resisted the invasion of the tumor cells. The fact that there was only a slight invasion of the inferior border of the right optic tract indicates the marked resistance of these structures to the infiltration.
Wilbrand and Saenger2 pointed out that direct invasion
VONDERAHE AR, ABRAMS NR. EPENDYMOMA OF THIRD VENTRICLE: REPORT OF A CASE WITH EXTENSION INTO THE OPTIC CHIASM AND WITH WIDESPREAD VEGETATIVE MANIFESTATIONS. Arch Ophthalmol. 1934;12(5):693–698. doi:10.1001/archopht.1934.00830180069005
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