Nuances in Localization and Surgical Treatment of Syringomyelia Associated with Fenestrated and Webbed Intradural Spinal Arachnoid Cyst A Retrospective Analysis.
World Neurosurg. 2015 Nov 13;
Authors: Srinivasan VM, Fridley J, Thomas J, Omeis I
INTRODUCTION: Intradural spinal arachnoid cysts (SAC) are among many etiologies for syringomyelia. Consequentially, neurological symptoms arise such as pain, gait disturbance, and bladder dysfunction. Identification of SAC on MR imaging can be challenging, as they can be fenestrated or in the form of fine webs.
METHODS: Imaging and clinical data for 7 patients who underwent surgical treatment for SAC associated with syringomyelia were reviewed. All previous publications of this pathology were reviewed via MEDLINE search.
RESULTS: Seven patients, mean aged of 59 years, were found to have a SAC causing syringomyelia. Intraoperative exploration confirmed SAC appearances of fine webs or a fluid filled loculation impinging on the spinal cord. Common presentations were back pain, gait disturbance, and bladder incontinence. Diagnosis was made by MRI, although in 3 cases, the SAC was not identified on the initial review. CT myelogram was performed in one case due to the enlarged syringomyelia and lack of obvious spinal cord compression. Thoracic laminectomy/laminoplasty was performed for all patients, centered at the level of a subtle indentation of the cord; the syringomyelia proper was not directly addressed. Postoperatively, all patients had complete resolution of their symptoms with MRI demonstrating resolution of the syringomyelia.
CONCLUSIONS: Careful evaluation of the MRI can demonstrate subtle indentation of the cord at the caudal or cephalad end of the syringomyelia and may obviate the need for additional imaging. Meticulous arachnoid dissection and establishment of good CSF flow is sufficient for resolution of the syringomyelia, averting the need for more aggressive procedures.
PMID: 26585730 [PubMed – as supplied by publisher]