{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,12,19]],"date-time":"2023-12-19T15:57:13Z","timestamp":1703001433426},"reference-count":4,"publisher":"Scientific Scholar","content-domain":{"domain":["surgicalneurologyint.com"],"crossmark-restriction":true},"short-container-title":[],"abstract":"<jats:sec id=\"st1\">\n<jats:title>Background: <\/jats:title>\n<jats:p>Cauda equina syndrome (CES) following posterior lumbar decompression is rare. Here, we present four postoperative cases of L5S1 surgery resulting in CES attributed to engorged ventral epidural veins that decreased spontaneously in three cases, while the fourth warranted a laminoplasty.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"st2\">\n<jats:title>Case Description: <\/jats:title>\n<jats:p>Four patients underwent posterior lumbar decompressions at the L5-S1 level, but developed postoperative symptoms\/signs of CES. Interestingly, in all four cases, cauda equina compression was attributed to engorgement of the ventral epidural venous plexus documented on magnetic resonance images (MRI) by the \u201cconvexity sign.\u201d Postoperatively, three patients\u2019 CES compression decreased spontaneously, but one required a laminoplasty.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"st3\">\n<jats:title>Conclusion: <\/jats:title>\n<jats:p>Postoperative CES occurred in four patients undergoing L5-S1 lumbar surgery. This deficit was attributed to marked engorgement of the ventral epidural plexus (i.e., yielding the \u201cconvexity sign\u201d on MRI) that resolved spontaneously in three patients, but warranted a laminoplasty in the fourth.<\/jats:p>\n<\/jats:sec>","DOI":"10.25259\/sni_157_2022","type":"journal-article","created":{"date-parts":[[2022,3,4]],"date-time":"2022-03-04T05:59:28Z","timestamp":1646373568000},"page":"82","update-policy":"http:\/\/dx.doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Cauda equina syndrome after L5-S1 posterior decompression surgery showing a \u201cconvexity sign\u201d caused by engorgement of the ventral epidural venous plexus: A case series"],"prefix":"10.25259","volume":"13","author":[{"given":"Motohiro","family":"Takayama","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Otsu City hospital, Otsu, Shiga, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshinori","family":"Maki","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Hikone Chuo Hospital, Hikone, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshinari","family":"Kawasaki","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Otsu City hospital, Otsu, Shiga, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"10894","published-online":{"date-parts":[[2022,3,4]]},"reference":[{"key":"10.25259\/SNI_157_2022\/ref-1","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1097\/00007632-200102010-00015","article-title":"Cauda equina syndrome as a postoperative complication in five patients operated for lumbar disc herniation","volume":"26","author":"Henriques","year":"2001","journal-title":"Spine (Phila Pa 1976)"},{"key":"10.25259\/SNI_157_2022\/ref-2","doi-asserted-by":"crossref","first-page":"1048.e15","DOI":"10.1016\/j.wneu.2017.05.078","article-title":"Cauda equina syndrome due to dural sac shift with engorgement of the epidural venous plexus: Rare complication after lumbar microdiscectomy","volume":"104","author":"Maki","year":"2017","journal-title":"World Neurosurg"},{"key":"10.25259\/SNI_157_2022\/ref-3","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1097\/00003086-198603000-00015","article-title":"Cauda equina syndrome: A complication of lumbar discectomy","volume":"204","author":"Mclaren","year":"1986","journal-title":"Clin Orthop Relat Res"},{"key":"10.25259\/SNI_157_2022\/ref-4","doi-asserted-by":"crossref","first-page":"451","DOI":"10.1007\/s00586-009-1170-y","article-title":"Cauda equina lesions as a complication of spinal surgery","volume":"19","author":"Podnar","year":"2010","journal-title":"Eur Spine J"}],"container-title":["Surgical Neurology International"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/surgicalneurologyint.com\/cauda-equina-syndrome-after-l5-s1-posterior-decompression-surgery-showing-a-convexity-sign-caused-by-engorgement-of-the-ventral-epidural-venous-plexus-a-case-series\/","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/surgicalneurologyint.com\/surgicalint-articles\/cauda-equina-syndrome-after-l5-s1-posterior-decompression-surgery-showing-a-convexity-sign-caused-by-engorgement-of-the-ventral-epidural-venous-plexus-a-case-series\/","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,3,4]],"date-time":"2022-03-04T05:59:32Z","timestamp":1646373572000},"score":1,"resource":{"primary":{"URL":"http:\/\/surgicalneurologyint.com\/surgicalint-articles\/cauda-equina-syndrome-after-l5-s1-posterior-decompression-surgery-showing-a-convexity-sign-caused-by-engorgement-of-the-ventral-epidural-venous-plexus-a-case-series\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,3,4]]},"references-count":4,"alternative-id":["10.25259\/SNI_157_2022"],"URL":"https:\/\/doi.org\/10.25259\/sni_157_2022","relation":{},"ISSN":["2152-7806"],"issn-type":[{"value":"2152-7806","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,3,4]]},"article-number":"82"}}