20.500.12556/RUL-190791 Interdural spinal cyst following lumbar puncture illustrative case Background: Interdural spinal cysts are rare lesions located between the layers of the dura mater, not included in traditional spinal cyst classifications. Only 12 cases have been reported in the literature, with two located in the lumbar region. This case represents the first reported lumbar interdural cyst developing as a direct complication of a single lumbar puncture. Observations: A 44-year-old woman developed severe radicular pain 1 week after undergoing a diagnostic lumbar puncture; the pain was posture dependent, worsening when upright and improving when recumbent. MRI revealed a cystic lesion at L3-4 without nerve root compression. CT myelography showed delayed contrast filling, indicating communication with the subarachnoid space. Surgical exploration confirmed an interdural cyst. Both dural layers were sutured to obliterate the cyst and the defect of the inner dural layer. Her radicular pain resolved postoperatively. Lessons: Interdural spinal cysts can form as a rare complication of lumbar puncture, causing persistent spinal pain. Such cysts should be considered in patients with unexplained, posture-dependent pain after lumbar puncture, as their dynamic nature may elude standard imaging. Suturing both dural layers to obliterate the cyst and repair the defect of the inner dural layer can effectively resolve the symptoms. cerebrospinal fluid fistula interdural cyst lumbar puncture radiculopathy spinal meningeal cyst true false true Angleški jezik Ni določen Članek v reviji 2026-11-04 09:42:42 2026-11-04 09:42:47 2026-11-06 04:29:20 0000-00-00 00:00:00 2026 0 0 5 str. iss. 21 Vol. 11 May 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 617 2694-1902 10.3171/CASE2652 301536259 RAZ_Serbec_Anja_2026.pdf RAZ_Serbec_Anja_2026.pdf 1 49257578F09B64DBFDFBD0F3770EAB64 a8a5bcb35c747e7dd828de42d6455d1a22537d966af98fbabdd46cbb72ca144f 0c6b0508-d82c-11f1-aea2-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=252434 https://thejns.org/caselessons/view/journals/j-neurosurg-case-lessons/11/21/article-CASE2652.xml?product=caselessons 1 a5b9ea12-d82b-11f1-aea2-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=252433 Medicinska fakulteta 0 0 0