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Homonymous quadrantanopia respecting the horizontal meridian

A feature of striate and extrastriate cortical disease

From the Departments of Neuro-ophthalmology (Dr. McFadzean) and Neuroradiology (Dr. Hadley), Institute of Neurological Sciences, Glasgow, Scotland.

Address correspondence and reprint requests to Dr. Robert McFadzean, Department of Neuro-ophthalmology, Institute of Neurological Sciences, Southern General Hospital, 1345 Govan Road, Glasgow, G51 4TF.

It has been proposed that homonymous quadrantanopic visual field loss that respects the horizontal meridian is a pathognomonic sign of extrastriate cortical disease. However, two patients with this sign are reported-one with a rare striate and the other with an extrastriatal lesion of the visual cortex. It is therefore hypothesized that a homonymous quadrantanopia respecting the horizontal meridian may indicate striate and/or extrastriate cortical disease.

Received February 7, 1997. Accepted in final form July 7, 1997.