[Quadruple sectoranopia].
Quadruple sectoranopia is a rare campimetric syndrome involving upper and lower, homonymous, congruent field blind sectors sparing a horizontal zone. Ischemia or infarction of the lateral parts of the lateral geniculate body, supplied by the distal part of the anterior choroidal artery, accounts for the visual field defect. Ganglionic nerve fiber atrophy matched to the visual field defect may be found if the lateral geniculate body dysfunction involves infarction. The four cases reported so far involve the following etiologies: a case of surgical ligation of the distal part of the anterior choroidal artery during cerebral meningioma removal, two cases of stroke with anterior choroidal artery infarction, and a case of vascular steal with anterior choroidal artery blood flow being shunted away from the lateral geniculate body by an arteriovenous malformation. If lateral geniculate body infarction is not solely involved, partial recovery may occur, ischemic quiescent neuronal areas being able to resume their activity following ischemia resolution.
Denion
E
E
Centre d'Exploration Fonctionnelle de la Vision, Hôpital Roger Salengro, Lille. edenion@wanadoo.fr
Defoort-Dhellemmes
S
S
Arndt
C-F
CF
Hache
J-C
JC
D005829:Geniculate Bodies / Q000098:blood supply; D006801:Humans; D007511:Ischemia / Q000150:complications; D012607:Scotoma / Q000209:etiology / Q000473:pathology; D013577:Syndrome; D058609:Visual Field Tests