Acute Conus Medullaris Syndrome Following Minimally Invasive Lumbar Discectomy: A Case Report with Narrative Review
Abstract
Introduction:Lumbar disc herniation is a common cause of low back pain, often managed surgically via discectomy. While generally safe, discectomy may result in rare but serious complications such as conus medullaris syndrome (CMS). Most reported cases of CMS develop days to months postoperatively due to mechanical compression or vascular anomalies. Immediate-onset CMS without radiological abnormalities is exceptionally rare.
Case Presentation:We report the case of a 43-year-old man who developed acute CMS following an uneventful L3/L4 tubular microdiscectomy that occurred within hours. The symptoms were bilateral foot drop, saddle anesthesia and urinary retention. On urgent MRI, the conus medullaris was free of any compressive lesions or signal changes. Clinical follow-up showed a dramatic improvement in neurological status of the patient.
Conclusion:This case provides evidence to transient microvascular ischemia that may be involved in acute CMS presentation without radiologic abnormalities. Prompt clinical identification, use of perfusion imaging, and hemodynamic support may enhance outcomes in similar presentations.
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References
Wu A, March L, Zheng X, Huang J, Wang X, Zhao J, et al. Global low back pain prevalence and years lived with disability from 1990 to 2020: Findings from the Global Burden of Disease Study 2021. Lancet Rheumatol. 2023;5(7):e450–e460.
World Health Organization. Low back pain [Internet]. Geneva: WHO; 2023 Jul [cited 2025 May 20]. Available from: https://www.who.int/news-room/fact-sheets/detail/low-back-pain
Shankar H, Scarlett JA. Lumbar disc herniation. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 [cited 2025 May 20]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK560878/
Rajasekaran S, Bajaj N, Tubaki V, Shetty AP, Murugan S. The impact of high-intensity zone on the outcome of lumbar disc herniation. J Orthop Surg Res. 2015;10:150.
Öztürk O, Akçakaya MO, İmer M. The results and complications of interlaminar endoscopic approach for lumbar disc herniation: An overview of a single-surgeon experience. J Turkish Spinal Surg. 2024;35(4):138–144.
Boadi BI, Ikwuegbuenyi CA, Inzerillo S, Dykhouse G, Bratescu R, Omer M, et al. Complications in minimally invasive spine surgery in the last 10 years: A narrative review. Neurospine. 2024;21(3):770–803.
Li WS, Yan Q, Li GY, Chen WT, Cong L. Global research productivity in the field of discectomy on lumbar disc herniation: A systematic bibliometric analysis. Front Surg. 2023;10:1046294.
Asakuno K, Matsumoto M, Toyama Y. Dural arteriovenous fistula and progressive conus medullaris syndrome as complications of lumbar discectomy. J Neurosurg Spine. 2002;97(3):375–379.
Stevens JM, Barker CS, Dillon WP. Occult spinal dural arteriovenous fistula causing rapidly progressive conus medullaris syndrome after lumbar microdiscectomy. Spine J. 2009;9(9):e6–e10.
Kramer CL, Simkovic T, Ghuman A. Spinal cord ischemia/infarct after cauda equina syndrome from disc herniation: Case study and literature review. Surg Neurol Int. 2019;10:109.
Kobayashi M. The utility of diffusion-weighted imaging in patients with spinal cord infarction: Difference from neuromyelitis optica spectrum disorder. BMC Neurol. 2022;22:382.
American Association of Neuromuscular & Electrodiagnostic Medicine. Recommended policy for electrodiagnostic medicine. 2023 [cited 2025 May 20]. Available from: https://www.aanem.org/docs/default-source/documents/recommended-policy-2023.pdf
Ouyang Y, Qu Y, Dong RP, Kang MY, Yu T, Cheng XL, Zhao JW. Spinal dural arteriovenous fistula 8 years after lumbar discectomy surgery: A case report and review of literature. World J Clin Cases. 2021;9(20):5594–5604..
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Copyright (c) 2025 Bilal Ibrahim, Bilal Ibrahim, Abdallah Arabyat, Mohammad Y. Hiasat, Mustafa Nadi, Waleed F. Dabbas

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