title: Visual-evoked responses. A new abnormality with focal retinal damage.
abstract: A new monocular pattern-shift visual-evoked response abnormality seen with focal retinal damage is described in a patient with a right parietal malignant astrocytoma treated with 3 pulse doses of unilateral intra-arterial carotid BCNU to a cumulative dose of 750/mg/M2. Ophthalmoscopy showed a minimally blurred right optic disc edge with a large flame-shaped hemorrhage in the right superior quadrant at 11 o'clock, one disc diameter from the disc. Visual-evoked response with right eye stimulation demonstrated prolongation of the major P-100 wave in the right occipital area but not the left. Left eye stimulation was normal at both occipital electrodes. Unilateral occipital slowing ipsilateral to pattern shift presentation--with normal evoked responses from the contralateral eye--was seen in a patient with pathology of the retina. Abnormalities of visual-evoked responses must be interpreted in the context of a good ophthalmoscopic examination and not attributed solely to pathology in the optic nerve and more central structures of the nervous system.
mesh_terms: D001254:Astrocytoma / Q000150:complications / Q000188:drug therapy; D001932:Brain Neoplasms / Q000150:complications / Q000188:drug therapy; D002330:Carmustine / Q000627:therapeutic use; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008875:Middle Aged; D010296:Parietal Lobe; D010781:Photography; D012164:Retinal Diseases / Q000503:physiopathology*
chemical_list: D002330:Carmustine