Cerebral polyopia after recovery of homonymous hemianopia resulting from occipital lobe infarction

Abstract

A 48-year-old man suffering from right occipital lobe infarction had left homonymous hemianopia. Six months later, his visual defect had recovered almost completely. He started to complain of diplopia. On ocular examination, he had intermittent bilateral monocular diplopia. The diplopia could not be eliminated with a pinhole goggle. There was no ocular abnormality that may have caused his diplopia. MR imaging showed encephalomalasia over the extrastriate visual cortex and intact primary visual cortex. Although rare, cerebral polyopia of occipital lobe lesion should be considered in the differential diagnosis of monocular diplopia.