Pressure on the chiasm.
D000236:Adenoma / Q000150:complications; D000293:Adolescent; D000328:Adult; D000368:Aged; D001254:Astrocytoma / Q000150:complications; D001932:Brain Neoplasms / Q000150:complications; D002648:Child; D003397:Craniopharyngioma / Q000150:complications; D004806:Ependymoma / Q000150:complications; D005260:Female; D006423:Hemianopsia / Q000209:etiology*; D006801:Humans; D008297:Male; D008579:Meningioma / Q000150:complications; D008875:Middle Aged; D009897:Optic Chiasm; D010911:Pituitary Neoplasms / Q000150:complications