Acute asymmetric upper nasal quandrantanopsia caused by a chiasmal colloidcyst in a patient with multiple sclerosis and bilateral retrobulbar neuritis

PURPOSE: To report a patient with multiple sclerosis and a history of seque ntial bilateral retrobulbar neuritis, who developed new onset of highly asy mmetric upper qua, drantanopsia. DESIGN: Interventional case report. METHOD: A 36-year-old woman with multiple sclerosis and bilateral retrobulb ar neuritis developed an acute asymmetric upper nasal quadrantanopsia. RESULTS: Magnetic resonance imaging of the brain re, vealed a cyst that cau sed chiasmal compression and bilateral visual field defects. CONCLUSION: New onset of bilateral visual field defects in a patient with d iagnosed multiple sclerosis is likely to be caused by a new attack of the d emyelinating disease. In this case, a newly diagnosed chiasmal colloid cyst was the cause of visual field defects. (C) 2001 by Elsevier Science Inc. A ll rights reserved.