title: Homonymous visual field defects in patients without corresponding structural lesions on neuroimaging.
abstract: Homonymous visual field defects usually occur with structural processes affecting retrochiasmal visual pathways. The responsible lesion is usually evident on magnetic resonance imaging or on other neuroimaging studies. When results of neuroimaging are normal, functional illness is often suspected. The authors report four patients with homonymous visual field defects who presented with no evident corresponding lesion on magnetic resonance or computed tomography imaging. Etiologies for the visual field defects included the Heidenhain variant of Creutzfeldt-Jacob disease, degenerative dementia, subtle occipital ischemia demonstrated only on positron-emission tomography scanning, and nonketotic hyperglycemia. Clinicians should be aware of the alternative etiologies of organic homonymous visual field loss in patients with normal neuroimaging.
authors.affiliation: Department of Neurology, Mayo Clinic-Jacksonville, Florida 32224, USA.
authors.forename: P W
authors.initials: PW
authors.lastname: Brazis
authors.forename: A G
authors.initials: AG
authors.lastname: Lee
authors.forename: N
authors.initials: N
authors.lastname: Graff-Radford
authors.forename: N P
authors.initials: NP
authors.lastname: Desai
authors.forename: E R
authors.initials: ER
authors.lastname: Eggenberger
mesh_terms: D000368:Aged; D002545:Brain Ischemia / Q000150:complications* / Q000175:diagnosis; D007562:Creutzfeldt-Jakob Syndrome / Q000150:complications* / Q000175:diagnosis; D003704:Dementia / Q000150:complications / Q000175:diagnosis; D004569:Electroencephalography; D005260:Female; D006423:Hemianopsia / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D006943:Hyperglycemia / Q000150:complications* / Q000175:diagnosis; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009778:Occipital Lobe / Q000098:blood supply*; D014057:Tomography, X-Ray Computed; D014792:Visual Acuity; D058609:Visual Field Tests; D014794:Visual Fields