optic chiasma

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optic chiasma

[′äp·tik kī′az·mə]
(neuroscience)
The partial decussation of the optic nerves on the undersurface of the hypothalamus.
References in periodicals archive ?
In this patient, due to adherence to the vital structures, such as cavernous sinus and optic chiasm, we could not resect the capsule of the tumor totally to avoid possible additional neurologic complications.
Vimentin immunoreactivity (IR) was observed at the zone of the optic chiasm and the third ventricle of hypothalamus, in the supra optic nuclei (SO) and optic chiasm (OC) (Fig.
A control magnetic resonance study revealed dilation of the ventricles, bilateral thinning of the optic nerves, and prominent atrophy on the right side of the optic chiasm (Fig.
A craniopharyngioma can develop in the pituitary stalk in the suprasellar region, next to the optic chiasm (Recht, 2005), and invade the sella turcica, shifting important neurologic structures around it.
Past the optic chiasm, everything from the left visual field is now processed in the right hemisphere and everything from the right visual field is now processed in the left hemisphere.
IVb: Tumor is an intracranial intradural mass that does infiltrate the cavernous sinus, pituitary fossa, or optic chiasm.
12 Similar to the previous scan Similar to the previous scan (at 9th month of therapy) (at 9th month of therapy) 15 Normal cranial MRI findings, The lesion on the level of except for a 2-3 mm optic chiasm disappeared.
For instance, retinal ganglion cells from the nasal retina must cross the midline of the cortex, through the optic chiasm (Fig 2), to the contralateral hemisphere.
A MRI detected a tumor that had grown within the optic chiasm, impairing her vision and pressing on the hypothalamus gland.
Transsphenoidal surgery was performed for diagnosis, resection of the mass, and decompression of the optic chiasm.
A high-definition multileaf collimator, or beam-shaping device, shapes the dose so that it closely matches the shape of the targeted tumor, in order to precisely carry out delicate radiosurgical procedures near critical structures like the optic chiasm, brain stem, or spinal cord.
Several critical structures traverse this area, including the circle of Willis, optic nerves and optic chiasm, hypothalamus, pituitary infundibulum, and the infundibular and suprachiasmatic recesses of the third ventricle.