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病史：
夏茗悠A 66-year-old man with intermittent weakness and numbness of his legs and difficulty walking电商知识服务
鲴鱼图片>碘化银人工降雨男，66岁，间歇性双下肢疲软和麻木、行走困难
作者及单位：
N. Zakhari, S. Chakraborty
Neuroradiology Department；The Ottawa Hospital Ottawa, Ontario, Canada
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图片说明：
Sagittal T2WI (A) and CT myelogram (C) show focal indentation on the dorsal surface of the thoracic spinal cord, giving the “scalpel sign” (arrows). Axial T2WI above the level of the indentation (B) shows incread signal within the cord. CT myelogram at the level of the indentation (C, D) shows smooth ventral surface of the cord and opacification of the widened CSF space dorsally.
诊断：胸髓背侧蛛网膜网带
Dorsal Thoracic Arachnoid Web
Background:
Arachnoid webs are intradural extramedullary transver bands causing indentation on the dorsal surface of the spinal cord, with predilection for the upper thoracic spine.
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