Machii K, Watanabe Y, Narita Y, Kuzuhara S, Mezaki T
Department of Neurology, Matsusaka Chuo Hospital.
Rinsho Shinkeigaku. 1994 Aug;34(8):823-6.
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.
我们报告一例67岁男性的视觉留存病例。他在66岁之前身体状况良好，之后右侧枕叶发生脑出血。在进行血肿清除手术后，出现视幻觉并持续了约6个月。一年半后，他发生惊厥发作，开始服用苯妥英钠。惊厥发作后的两周内，他多次经历视觉留存、视幻觉和视物变形发作。MRI显示右侧枕叶有陈旧性出血。123I-IMP SPECT显示，在视觉留存发作一天后，右侧枕叶内侧脑血流量增加，发作约三周后减少。导致视觉留存的机制仍有待阐明。本病例的123I-IMP SPECT结果表明，视觉留存可能由右侧枕叶发作后短暂的功能兴奋引起。
