{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T06:43:20Z","timestamp":1792651400862,"version":"4.5.0"},"reference-count":10,"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>Congenital anomalies of the atlas are rare and usually occur in conjunction with other congenital variants. They include a wide spectrum of anomalies ranging from clefts to hypoplasia or aplasia of its arches that may contribute to spinal cord compressive syndrome.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"st2\">\n<jats:title>Case Description: <\/jats:title>\n<jats:p>A 54-year-old male presented with the sudden onset of a severe quadriparesis and loss of proprioception after a minor fall. The magnetic resonance (MR) scan showed cord compression at the C1 level attributed to C1 arch hypoplasia. Two months following a decompressive C1 laminectomy without fusion, and the patient was symptom free.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"st3\">\n<jats:title>Conclusion: <\/jats:title>\n<jats:p>Posterior C1 arch hypoplasia is a rare anomaly that can contribute to cervical cord compression and myelopathy. The optimal surgical management may include, as in this case, a posterior decompression without fusion.<\/jats:p>\n<\/jats:sec>","DOI":"10.25259\/sni_820_2021","type":"journal-article","created":{"date-parts":[[2021,12,20]],"date-time":"2021-12-20T05:58:24Z","timestamp":1639979904000},"page":"623","update-policy":"https:\/\/doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Hypoplasia of C1\u2019s posterior arch: Is there an ideal anatomical classification?"],"prefix":"10.25259","volume":"12","author":[{"given":"Messias Gon\u00e7alves Pacheco","family":"Junior","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Ant\u00f4nio Pedro University Hospital, Federal Fluminense University, Niteroi, Rio de Janeiro, Brazil."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicoly Augusta da Silva Quezada","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Ant\u00f4nio Pedro University Hospital, Federal Fluminense University, Niteroi, Rio de Janeiro, Brazil."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raphael Tavares","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Ant\u00f4nio Pedro University Hospital, Federal Fluminense University, Niteroi, Rio de Janeiro, Brazil."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jose Alberto","family":"Landeiro","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Ant\u00f4nio Pedro University Hospital, Federal Fluminense University, Niteroi, Rio de Janeiro, Brazil."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruno Lima","family":"Pessoa","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Ant\u00f4nio Pedro University Hospital, Federal Fluminense University, Niteroi, Rio de Janeiro, Brazil."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"10894","published-online":{"date-parts":[[2021,12,20]]},"reference":[{"key":"10.25259\/SNI_820_2021\/ref-1","doi-asserted-by":"crossref","first-page":"38","DOI":"10.4103\/0974-8237.85312","article-title":"Spinal canal stenosis at the level of Atlas","volume":"2","author":"Bhattacharjee","year":"2011","journal-title":"J Craniovertebr Junction Spine"},{"key":"10.25259\/SNI_820_2021\/ref-2","first-page":"249","article-title":"Congenital defects of the posterior arch of the atlas: A report of seven cases including an affected mother and son","volume":"15","author":"Currarino","year":"1994","journal-title":"AJNR Am J Neuroradiol"},{"key":"10.25259\/SNI_820_2021\/ref-3","doi-asserted-by":"crossref","first-page":"1223","DOI":"10.1007\/s00586-013-2682-z","article-title":"Congenital C1 arch deficiency: Grand round presentation","volume":"22","author":"Elmalky","year":"2013","journal-title":"Eur Spine J"},{"key":"10.25259\/SNI_820_2021\/ref-4","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1016\/S1726-4901(08)70015-7","article-title":"Cervical spinal stenosis and myelopathy due to atlas hypoplasia","volume":"70","author":"Hsu","year":"2007","journal-title":"J Chin Med Assoc"},{"key":"10.25259\/SNI_820_2021\/ref-5","first-page":"211","article-title":"Atlantal stenosis: A rare cause of quadriparesis in a child","volume":"92","author":"Liliang","year":"2000","journal-title":"J Neurosurg"},{"key":"10.25259\/SNI_820_2021\/ref-6","first-page":"133","article-title":"Cervical cord compression due to a hypoplastic atlas","volume":"94","author":"May","year":"2001","journal-title":"J Neurosurg"},{"key":"10.25259\/SNI_820_2021\/ref-7","doi-asserted-by":"crossref","first-page":"e5563","DOI":"10.1097\/MD.0000000000005563","article-title":"Ossification of the posterior atlantoaxial membrane associated with atlas hypoplasia A case report","volume":"95","author":"Meng","year":"2016","journal-title":"Medicine"},{"key":"10.25259\/SNI_820_2021\/ref-8","doi-asserted-by":"crossref","first-page":"629","DOI":"10.1097\/00006123-199809000-00140","article-title":"Cervical myelopathy caused by hypoplasia of the atlas: Two case reports and review of the literature","volume":"43","author":"Phan","year":"1998","journal-title":"Neurosurgery"},{"key":"10.25259\/SNI_820_2021\/ref-9","doi-asserted-by":"crossref","first-page":"346","DOI":"10.1007\/BF00344180","article-title":"Marked canal stenosis at the level of the atlas","volume":"31","author":"Sawada","year":"1989","journal-title":"Neuroradiology"},{"key":"10.25259\/SNI_820_2021\/ref-10","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1590\/S0041-87812002000200005","article-title":"Agenesis of the posterior arch of the atlas","volume":"57","author":"Torriani","year":"2002","journal-title":"Rev Hosp Clin Fac Med Sao Paulo"}],"container-title":["Surgical Neurology International"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/surgicalneurologyint.com\/hypoplasia-of-c1s-posterior-arch-is-there-an-ideal-anatomical-classification\/","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/surgicalneurologyint.com\/surgicalint-articles\/hypoplasia-of-c1s-posterior-arch-is-there-an-ideal-anatomical-classification\/","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,12,20]],"date-time":"2021-12-20T05:58:33Z","timestamp":1639979913000},"score":1,"resource":{"primary":{"URL":"http:\/\/surgicalneurologyint.com\/surgicalint-articles\/hypoplasia-of-c1s-posterior-arch-is-there-an-ideal-anatomical-classification\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,12,20]]},"references-count":10,"alternative-id":["10.25259\/SNI_820_2021"],"URL":"https:\/\/doi.org\/10.25259\/sni_820_2021","relation":{},"ISSN":["2152-7806"],"issn-type":[{"value":"2152-7806","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,12,20]]},"article-number":"623"}}