title: Occipital infarction revealed by quadranopsia following snakebite by Bothrops lanceolatus.
abstract: We report a case of snakebite in which envenomation was manifested through impairment of the visual field. The patient, a 46-year-old man, was bitten on the right thumb by Bothrops lanceolatus. Treatment with a specific equine antivenom (Bothrofav) was administered one hour after the bite. With the exception of fang marks, the results of a clinical examination, particularly the neurologic component, were normal. The day after the bite, the patient developed an inferior left lateral homonymous quadranopsia with macular epargne. T2 magnetic resonance imaging showed a right occipital infarction. His condition improved clinically and biologically. This observation of snakebite is the first in which envenomation was accompanied exclusively by an impairment of the visual field. Envenomation by B. lanceolatus is distinct in its incidence of significant thrombotic complications at a distance from the site of the bite.
authors.affiliation: Department of Ophthalmology, University Hospital Center of Fort de France, Fort de France, Martinique. harold.merle@chu-fortdefrance.fr
authors.forename: Harold
authors.initials: H
authors.lastname: Merle
authors.forename: Angélique
authors.initials: A
authors.lastname: Donnio
authors.forename: Lucas
authors.initials: L
authors.lastname: Ayeboua
authors.forename: Yves
authors.initials: Y
authors.lastname: Plumelle
authors.forename: Didier
authors.initials: D
authors.lastname: Smadja
authors.forename: Laurent
authors.initials: L
authors.lastname: Thomas
mesh_terms: D000818:Animals; D000997:Antivenins / Q000627:therapeutic use; D017837:Bothrops; D020520:Brain Infarction / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009778:Occipital Lobe / Q000473:pathology*; D012909:Snake Bites / Q000188:drug therapy / Q000473:pathology*
chemical_list: D000997:Antivenins