{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T16:06:48Z","timestamp":1776096408297,"version":"3.50.1"},"reference-count":24,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"13","license":[{"start":{"date-parts":[[2026,3,30]],"date-time":"2026-03-30T00:00:00Z","timestamp":1774828800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Neurosurg Case Lessons"],"published-print":{"date-parts":[[2026,3,30]]},"abstract":"<jats:sec>\n                    <jats:title>BACKGROUND<\/jats:title>\n                    <jats:p>The unified theory of split spinal cord malformation (SCM) comprises type I, with each one of the hemicords in one own dural tube, separated by a bone spur, and type II, with two hemicords in one dural tube, separated by a nonrigid septum. This classification is still evolving, with denominations SCM type 0.5 proposed for incomplete forms, SCM type 1.5 for lesions combining features of SCM types I and II, and SCM type III for the composite lesions occurring on different spinal levels.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>OBSERVATIONS<\/jats:title>\n                    <jats:p>A newborn male patient presented with a complex SCM with two placodes, one in each hemicord, contained in one myelomeningocele (MMC) sac. In addition, caudal regression of the lumbosacral spine, hydrocephalus, and herniation of cerebellar tonsils down to thoracic levels were detected.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>LESSONS<\/jats:title>\n                    <jats:p>This complex case of two asymmetrical nonneurulated hemicords attached to a single MMC sac, opening on different levels of the bone spur and on the right side covered by a rudimentary hemilamina, illustrates the difficulties in classifying SCMs. Since up to 15% of MMC patients additionally have SCM, the case description underlines the role of preoperative MRI in newborns before neurosurgical MMC closure.<\/jats:p>\n                    <jats:p>\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/thejns.org\/doi\/10.3171\/CASE251036\">https:\/\/thejns.org\/doi\/10.3171\/CASE251036<\/jats:ext-link>\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3171\/case251036","type":"journal-article","created":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T10:04:42Z","timestamp":1775642682000},"source":"Crossref","is-referenced-by-count":0,"title":["Congenital myelomeningocele containing two hemicords with placodes in a patient with complex split spinal cord malformation: illustrative case"],"prefix":"10.3171","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2963-4344","authenticated-orcid":true,"given":"Ulf","family":"Nestler","sequence":"first","affiliation":[{"name":"Pediatric Neurosurgery, Pediatric University Hospital, Lenval Foundation, Nice"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tsirimalala","family":"Rakotomaro","sequence":"additional","affiliation":[{"name":"Pediatric Neurosurgery, Pediatric University Hospital, Lenval Foundation, Nice"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Audrey","family":"Dupont","sequence":"additional","affiliation":[{"name":"Pediatric Intensive Care Unit, Pediatric University Hospital, Lenval Foundation, Nice"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mathilde","family":"Mayerus","sequence":"additional","affiliation":[{"name":"Neonatal Intensive Care Unit, Archet Hospital, University Hospital, Nice"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Florence","family":"Casagrande","sequence":"additional","affiliation":[{"name":"Neonatal Intensive Care Unit, Archet Hospital, University Hospital, Nice"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aur\u00e9lie","family":"Occelli","sequence":"additional","affiliation":[{"name":"Pediatric Radiology, Pediatric University Hospital, Lenval Foundation, Nice, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nathalie","family":"Chivoret","sequence":"additional","affiliation":[{"name":"Pediatric Neurosurgery, Pediatric University Hospital, Lenval Foundation, Nice"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"bib1","series-title":"World Neurosurg","article-title":"Foundations of myelomeningocele management: history, embryology, diagnosis, and treatment of myelomeningoceles through the Sheffield Study","volume":"199","author":"Adapa","year":"2025","unstructured":"Adapa ARTeasley DEFogel HFeldstein N.Foundations of myelomeningocele management: history, embryology, diagnosis, and treatment of myelomeningoceles through the Sheffield Study. World Neurosurg. 2025;199:123984. doi:10.1016\/j.wneu.2025.123984"},{"issue":"3","key":"bib2","series-title":"Pediatr Neurosurg","first-page":"119","article-title":"Occurrence of split cord malformation in meningomyelocele: complex spina bifida","volume":"36","author":"Kumar","year":"2002","unstructured":"Kumar RBansal KKChhabra DK.Occurrence of split cord malformation in meningomyelocele: complex spina bifida. Pediatr Neurosurg. 2002;36(3):119-127. doi:10.1159\/000048366"},{"issue":"4","key":"bib3","series-title":"J Neurosurg","first-page":"281","article-title":"Split cord malformation associated with myelomeningocele","volume":"107","author":"Ansari","year":"2007","unstructured":"Ansari SNejat FYazdani SDadmehr M.Split cord malformation associated with myelomeningocele. J Neurosurg. 2007;107(4)(suppl):281-285. doi:10.3171\/PED-07\/10\/281"},{"issue":"3","key":"bib4","series-title":"Br J Neurosurg","first-page":"200","article-title":"Split cord malformations in myelomeningocele patients","volume":"14","author":"Iskandar","year":"2000","unstructured":"Iskandar BJMcLaughlin COakes WJ.Split cord malformations in myelomeningocele patients. Br J Neurosurg. 2000;14(3):200-203. doi:10.1080\/026886900408360"},{"issue":"2","key":"bib5","series-title":"Childs Nerv Syst","first-page":"96","article-title":"Split spinal cord malformations: report of 22 cases and review of the literature","volume":"19","author":"Schijman","year":"2003","unstructured":"Schijman E.Split spinal cord malformations: report of 22 cases and review of the literature. Childs Nerv Syst. 2003;19(2):96-103. doi:10.1007\/s00381-002-0675-z"},{"issue":"3","key":"bib6","series-title":"Neurosurgery","first-page":"481","article-title":"Split cord malformation: part II: clinical syndrome","volume":"31","author":"Pang","year":"1992","unstructured":"Pang D.Split cord malformation: part II: clinical syndrome. Neurosurgery. 1992;31(3):481-500. doi:10.1227\/00006123-199209000-00011"},{"key":"bib7","series-title":"World Neurosurg","first-page":"142","article-title":"Type 1.5 split cord malformations: an uncommon entity","volume":"133","author":"Meena","year":"2020","unstructured":"Meena RKDoddamani RSGurjar HKKumar AChandra PS.Type 1.5 split cord malformations: an uncommon entity. World Neurosurg. 2020;133:142-149. doi:10.1016\/j.wneu.2019.09.076"},{"key":"bib8","series-title":"Pol J Radiol","first-page":"e46","article-title":"Split cord malformation\u2014a simple, current classification based on CT and MRI neuroimaging studies","volume":"90","author":"Kleinrok","year":"2025","unstructured":"Kleinrok JKleinrok KPopiela TJ.Split cord malformation\u2014a simple, current classification based on CT and MRI neuroimaging studies. Pol J Radiol. 2025;90:e46-e54. doi:10.5114\/pjr\/199683"},{"issue":"5","key":"bib9","series-title":"Neurol Med Chir (Tokyo)","first-page":"426","article-title":"Myelomeningocele associated with split cord malformation type I\u2014three case reports","volume":"50","author":"Higashida","year":"2010","unstructured":"Higashida TSasano MSato HSekido KIto S.Myelomeningocele associated with split cord malformation type I\u2014three case reports. 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