• Zakariae Benyaich, Mehdi Laghmari, and Ait BenaliSaidSDepartment of Neurosurgery, Mohamed the VIth University Hospital Center of Marrakech, Marrakech, Morocco; Faculty of Medicine and Pharmacy of Marrakech, Cadi Ayyad University, Marrakech, Morocco..
• Department of Neurosurgery, Mohamed the VIth University Hospital Center of Marrakech, Marrakech, Morocco. Electronic address: zakariae.benyaich@gmail.com.
• World Neurosurg. 2021 Apr 1; 148: 116-117.

AbstractArachnoiditis ossificans of the spine is a rare entity defined as an ossification of the leptomeninges resulting in neurologic decline. We describe the case of a 42-year-old woman, without any obvious predisposing factor, who presented with a progressive cauda equina syndrome. The imaging findings on magnetic resonance imaging were confusing by showing an atypical intraspinal lesion extending from L1 to S1. The computed tomography scan was more specific by showing suggestive images of a huge arachnoiditis ossificans of the lumbar spine. The patient underwent a large lumbar laminectomy with an incomplete resection of the ossified arachnoid. The histologic study confirmed the bony nature of the lesion. This illustrative case highlights the importance of helical computed tomography scan with multiplanar reconstruction for the diagnosis of arachnoiditis ossificans.Copyright © 2021 Elsevier Inc. All rights reserved.

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