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MRI findings of DREZ-otomy lesions
1Department of Neurosurgery, Kurume University School of Medicine, Japan.
Abstract:
Pre- and postoperative MR findings in the spinal cord of 4 patients who underwent lesioning of the cervical dorsal root entry zone (DREZ-otomy) are reported. In 3 patients with root avulsion, MR images revealed spinal cord atrophy preoperatively and, after DREZ-otomy, long-lasting spinal cord enlargement and extensive intramedullary changes. In a case without root avulsion, the preoperative MR study showed no apparent abnormality and the only postoperative MR change was a discrete lesion well confined to the dorsal horn. The findings suggested basically different post-operative pathology among patients with root avulsion and those without. MRI can be a useful supplement to autopsy study in defining postoperative spinal cord changes after DREZ-otomy.
Insights
Magnetic resonance imaging (MRI) revealed distinct spinal cord changes after cervical dorsal root entry zone (DREZ-otomy) surgery. Findings differed significantly between patients with and without root avulsion, highlighting MRI
Area of Science:
- Neurosurgery
- Radiology
- Spinal Cord Imaging
Background:
- Cervical dorsal root entry zone (DREZ-otomy) is a surgical procedure for intractable pain.
- Postoperative changes in the spinal cord following DREZ-otomy require accurate assessment.
- Magnetic resonance imaging (MRI) is a key modality for evaluating spinal cord morphology.
Purpose of the Study:
- To characterize pre- and postoperative magnetic resonance imaging (MRI) findings in the spinal cord after cervical dorsal root entry zone (DREZ-otomy).
- To investigate differences in postoperative spinal cord pathology based on the presence or absence of root avulsion.
Main Methods:
- Retrospective analysis of pre- and postoperative MRI scans in 4 patients who underwent cervical DREZ-otomy.
- Correlation of imaging findings with surgical history, specifically root avulsion status.
Main Results:
- Patients with root avulsion showed preoperative spinal cord atrophy, followed by postoperative spinal cord enlargement and intramedullary changes.
- The patient without root avulsion had no preoperative abnormality and a discrete postoperative dorsal horn lesion.
- Distinct postoperative pathologies were observed in patients with and without root avulsion.
Conclusions:
- MRI findings after cervical DREZ-otomy differ significantly based on the presence of root avulsion.
- Postoperative spinal cord enlargement and intramedullary changes are associated with root avulsion.
- MRI is a valuable tool for evaluating postoperative spinal cord changes, complementing autopsy studies.