title: [123I-IMP SPECT findings of visual perseveration in a patient with old hemorrhage in the right occipital lobe].
abstract: We report a case of visual presevertation in a 67-year-old man. He had been well until 66 years of age when he had brain hemorrhage in the right occipital lobe. After an operation for removal of the hematoma, visual hallucination occurred and persisted for about 6 months. One year and a half later, he had a convulsive seizure and diphenylhydantoin was started. During the two weeks following the convulsion, he several times experienced episodes of visual preservation, visual hallucination and metamorphopsia. MRI revealed an old hemorrhage in the right occipital lobe. 123I-IMP SPECT demonstrated increase of cerebral blood flow of the right medial occipital lobe one day after the episode of visual perseveration and decrease about three weeks after the episode. The mechanism which causes visual perseveration still remains to be clarified. The findings of 123I-IMP SPECT of the present case suggest that visual perseveration may be generated by postictal transient functional excitation of the right occipital lobe.
authors.affiliation: Department of Neurology, Matsusaka Chuo Hospital.
authors.forename: K
authors.initials: K
authors.lastname: Machii
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Y
authors.initials: Y
authors.lastname: Narita
authors.forename: S
authors.initials: S
authors.lastname: Kuzuhara
authors.forename: T
authors.initials: T
authors.lastname: Mezaki
mesh_terms: D000368:Aged; D002543:Cerebral Hemorrhage / Q000150:complications* / Q000000981:diagnostic imaging*; D006212:Hallucinations / Q000209:etiology*; D006801:Humans; D008297:Male; D009778:Occipital Lobe / Q000000981:diagnostic imaging*; D015899:Tomography, Emission-Computed, Single-Photon; D014796:Visual Perception