optic chiasma


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Related to optic chiasma: corpus callosum, optic tract
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  • noun

Synonyms for optic chiasma

the crossing of the optic nerves from the two eyes at the base of the brain

References in periodicals archive ?
Cranial and pituitary magnetic resonance (MR) imaging revealed a mass with a size of approximately 3x3,5x3 cm which filled the base of the sella, obstructed the suprasellar cistern, formed crenation in the base of the third ventricle, compressed the left optic nevre and the optic chiasma on the left with regular borders having the same intensity as the heterogeneous gray matter in the T1A and T2A sequences and contrast enhancement following intravenous injection of contrast material (Figure 2).
Suprasellar extension of adenomas was causing displacement and compression of optic chiasma. 5 cases showed a "figure of 8" appearance.
It was causing suprasellar extension and abutment of optic chiasma. Cavernous sinus was not involved.
Gadolinium contrast enhanced MRI revealed the three masses of CT scan to be single mass involving the optic nerves, optic chiasma and extending along optic tract on both sides.
Magnetic resonance imaging (MRI) of the sellar area revealed a large intrasellar mass with a dimension of 15x14x12mm that extended to the suprasellar cisterns, with thickening of the infundibular stalk and elevating optic chiasma. After injection of gadolinium, the pituitary lesion was markedly enhanced except the central cystic or necrotic portion (Figure 1).
In another study on neuroepithelial cells migration in mice subsequent poisoning with vincristine during pregnancy has been expressed that this drug can cause abnormalities in the cephalic fold and optic chiasma which is seen from blight to Asymmetric growth [17].
Sometimes, MRI enables visualization of deeper structures--such as the optic chiasma, pituitary stalk, and the pituitary--that are not visible on ultrasound.
The origin of the spinal column from the brain, the pineal body (resembling a pine cone), the structure of the eye and at least some of the cranial nerves (optic with optic chiasma, oculomotor, trigeminal, facial, auditory and hypoglossal nerves) were identified.
The symptoms of this process are uncommon and nonspecific, despite the facts that (1) the pituitary gland is compromised and (2) there might be a downward traction of the optic chiasma. (2,3) An empty sella is often an incidental finding on computed tomography (CT) and magnetic resonance imaging (MRI).