CROSSED QUADRANT HOMONYMOUS HEMIANOPIA IN A CASE OF MULTIPLE-SCLEROSIS

We describe the first report of crossed quadrant hemianopsia (CQHH) oc curring in a patient with a well documented clinical history of Multip le Sclerosis (MS). The visual field studied by a Humphrey Field Analyz er (Mod.630, 30-2 program) showed a CQHH, involving right superior qua drants and left inferior ones. Magnetic resonance imaging (MRI) showed two lesions located in both left and right trigone area, correspondin g to the geniculocalcarine pathways. CQHH is a very rare visual field defect commonly caused by vertebro-basilar ischemia and attributed to bilateral injury of the calcarine fissure. In the absence of lesions i n the primary visual cortex, a direct relationship between the quadran tonopic defect and two small demyelinating lesions in posterior perive ntricular white matter, corresponding to the geniculocalcarine pathway s, is implied.