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KMID : 1036520160060020039
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Clinical Neuro-Ophthalmology
2016 Volume.6 No. 2 p.39 ~ p.42
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Diffusion MRI in a Case of Posterior Ischemic Optic Neuropathy
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Lee Jong-Min
Ryu Jae-Chan
Lee Tae-Kyeong
Park Ji-Yun
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Abstract
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Posterior ischemic optic neuropathy (PION) is caused by hypoperfusion to the retrobulbar portion of optic nerve with normal-appearing optic nerve head. PION is much less common than anterior ischemic optic neuropathy (AION), and classified into perioperative, arteritic, and nonarteritic forms. The diagnosis of PION depends on excluding other causes of retrobulbar optic neuropathy since there is no confirmatory diagnostic test for PION. The orbit MRI and fundus are usually normal in PION. However, the abnormalities in the injured optic nerve were rarely reported in PION assessed with imaging modalities. We reported a 46-year-old man with unilateral PION in which DWI showed high signal intensity in the left optic nerve along with decreased apparent diffusion coefficient (ADC). The MR imaging with DWI and ADC may play an important role in demonstrating optic nerve ischemia in PION.
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KEYWORD
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Ischemic optic neuropathy, Optic nerve disease, Giant cell arteritis
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