title: Chiasmal optic neuritis.
abstract: Two patients exhibiting bitemporal hemianopia due to chiasmal optic neuritis with pathological confirmation of noncompressive lesions are presented; the first due to a chronic, idiopathic demyelinating process, and the second a result of ethchlorvynol (Placidyl) toxicity. The literature regarding chiasmal optic neuritis is reviewed, and a discussion of other noncompressive causes of bitemporal hemianopia is presented.
mesh_terms: D000328:Adult; D003711:Demyelinating Diseases / Q000150:complications; D004984:Ethchlorvynol / Q000009:adverse effects; D005260:Female; D006423:Hemianopsia / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009897:Optic Chiasm; D009902:Optic Neuritis / Q000139:chemically induced / Q000175:diagnosis* / Q000209:etiology; D012607:Scotoma / Q000175:diagnosis
chemical_list: D004984:Ethchlorvynol