Rinsho Shinkeigaku (Clinical Neurology)

Case Report

A case of agnosia for streets without visual memory disturbance

Kazuko Aoki, M.D., Masahiko Hiroki, M.D., Mitsuaki Bando, M.D., Kazuhito Miyamoto, M.D. and Shunsaku Hirai, M.D.

Department of Neurology, Tokyo Metropolitan Neurological Hospital

A 70-year-old, right-handed man was admitted to our hospital for his sudden-onset topographical disorientation. He failed to find his way to familiar places, but he knew distance and direction to the places. Neurological examination revealed homonymous left-upper quadrantanopsia on Goldmann perimeter and hypoesthesia over the left side of his body. Magnetic resonance imaging showed an abnormal intensity area at the right medial temporo-occipital region, due to the infarct of the right posterior cerebral arterial territory. The neuropsychological examination revealed agnosia for streets, and prosopagnosia without any other disturbance of visual perception. Both visual and topographical memories were intact. It is suggested that, in this case, the agnosia for streets was caused by impairment of recognizing familiar streets and houses or disconnection between their recognition and memory.

(CLINICA NEUROL, 43: 335|340, 2003)
key words: topographical disorientation, agnosia for streets, brain infarction, visual memory disturbance

(Received: 15-Jan-03)