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optic chiasm

   Also found in: Medical, Encyclopedia, Wikipedia 0.02 sec.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.optic chiasm - the crossing of the optic nerves from the two eyes at the base of the brain
chiasm, chiasma, decussation - an intersection or crossing of two tracts in the form of the letter X


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Patients may have symptoms due to compression of adjacent structures, particularly the optic chiasm and optic nerves.
The etiologies of their visual impairments included retinopathy of prematurity, glaucoma, retinal detachment, amaurosis, optic chiasm tumors, sarcoid growth, injury, retinitis pigmentosa, diabetic retinopathy, retinal blastoma, macular degeneration, and unknown.
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.
 
 
 
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