Department of Neurosurgery, National Neurosciences Centre, Calcutta, India.
Department of Radiology, Peerless Hospital, Calcutta, India.
Neurocirugia (Astur : Engl Ed). 2022 Nov-Dec;33(6):366-370. doi: 10.1016/j.neucie.2021.07.003.
Dorsal arachnoidal webs are condensations of arachnoidal tissue densely adherent to the pial surface of the posterior aspect of the dorsal spinal cord. Infrequently described in literature they disrupt the flow of CSF in the spinal subarachnoid space leading to syringomyelia and myelopathy. While there are several theories on their origin, the "scalpel sign" on magnetic resonance imaging is considered to be pathognomonic of this condition. An illustrative case of a 58 year old man with syringomyelia and dorsal cord indentation who presented with spastic paraparesis, gait instability, parasthesias and bilateral non radicular upper limb pain that resolved following excision of the web is described to highlight the importance of considering this diagnosis when cases of so called "idiopathic" syringomyelia are encountered.
背侧蛛网膜炎是蛛网膜组织的密集凝聚物，紧密附着在脊髓背侧表面的脑皮层上。它们在文献中很少被描述，但会破坏脊髓蛛网膜下腔中的 CSF 流动，导致脊髓空洞症和脊髓病。虽然有几种关于它们起源的理论，但磁共振成像上的“手术刀征”被认为是这种情况的特征性表现。本文描述了一例 58 岁男性，患有脊髓空洞症和脊髓背侧压痕，表现为痉挛性截瘫、步态不稳、感觉异常和双侧非神经根性上肢疼痛，在切除蛛网膜炎后症状得到缓解，以强调在遇到所谓的“特发性”脊髓空洞症时，考虑这种诊断的重要性。
