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Homonymous hemianopsia in a case of mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes(MELAS) Yuko Miyake 1 , Masahiro Tonari 1 , Jun Sugasawa 1 , Hidehiro Oku 1 , Kazushi Yamane 2 , Hideto Nakajima 2 , Fumiharu Kimura 2 , Toshiaki Hanafusa 2 , Tsunehiko Ikeda 1 1Department of Ophthalmology, Osaka Medical College 2Department of Internal Medicine(Ⅰ), Osaka Medical College pp.471-477
Published Date 2016/4/15
DOI https://doi.org/10.11477/mf.1410211759

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Abstract Purpose: To report a case of mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episode(MELAS)who showed repeated episodes simulating epilepsy followed by homonymous hemianopsia.

Case: A 25-year-old woman was referred to us from the neurology department for suspected cerebral edema. She had had hypoacusia since 8 years before. She had showed vomiting followed by diplopia, abnormal visual field and epileptic seizures since 5 months before. She showed elevated level of lactose in the blood. Magnetic resonance imaging(MRI)showed elevated signal in the right cerebral hemisphere.

Findings: Corrected visual acuity was 10 right and 0.5 left. Routine ophthalmological findings were normal. Left homonymous hemianopsia was present without macular sparing. Genetic studies showed point mutation of mitochondrial gene A3243G, leading to the diagnosis of MELAS. Atrophy of temporal and occipital lobe in the right hemisphere progressed during the following 2 years with persistent left homonymous hemianopsia.

Conclusion: The present case illustrates that repeated episodes simulating epilepsy may be the initial manifestations of MELAS followed by homonymous hemianopsia.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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