{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,10,1]],"date-time":"2022-10-01T05:24:30Z","timestamp":1664601870345},"reference-count":6,"publisher":"Scientific Scholar","content-domain":{"domain":["surgicalneurologyint.com"],"crossmark-restriction":true},"short-container-title":[],"abstract":"\nBackground: <\/jats:title>\nRetro-odontoid pseudotumors (ROPs) typically present as a single mass posterior to the odontoid ranging from isointense to hypointense relative on T1-weighted magnetic resonance (MR) imaging (MRI T1WI). Here, a patient with ROP exhibited the double-layer sign on the MRI T1WI characterized by an initial ventral layer posterior to the odontoid process followed by a secondary dorsal layer.<\/jats:p>\n<\/jats:sec>\n\nCase Description: <\/jats:title>\nAn 84-year-old male presented with cervical myelopathy attributed to ROP resulting in atlantoaxial instability on dynamic X-ray studies, and the double-layer sign on the T1 MR accompanied by a cystic component. MR following C1\u2013C2 posterior fusion, the patient\u2019s myelopathy resolved and both layers spontaneously regressed on the follow-up MR studies.<\/jats:p>\n<\/jats:sec>\n\nConclusion: <\/jats:title>\nThe MR-documented double layer sign with ROP, likely attributable to reactive hypertrophy of the transverse ligament with cystic components, may demonstrate spontaneous MR regression with symptom resolution following a C1\u2013C2 posterior fusion.<\/jats:p>\n<\/jats:sec>","DOI":"10.25259\/sni_756_2022","type":"journal-article","created":{"date-parts":[[2022,9,30]],"date-time":"2022-09-30T09:45:45Z","timestamp":1664531145000},"page":"446","update-policy":"http:\/\/dx.doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Retro-odontoid pseudotumor presenting double layer on MRI: A case report"],"prefix":"10.25259","volume":"13","author":[{"given":"Ryo","family":"Kanematsu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junya","family":"Hanakita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshiyuki","family":"Takahashi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manabu","family":"Minami","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Izumi","family":"Suda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sho","family":"Nakamura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shu","family":"Takeuchi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshitaka","family":"Tsujimoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"10894","published-online":{"date-parts":[[2022,9,30]]},"reference":[{"key":"10.25259\/SNI_756_2022\/ref-1","doi-asserted-by":"crossref","first-page":"810","DOI":"10.3171\/jns.1996.85.5.0810","article-title":"Atlantoaxial degenerative articular cysts","volume":"85","author":"Birch","year":"1996","journal-title":"J Neurosurg"},{"key":"10.25259\/SNI_756_2022\/ref-2","doi-asserted-by":"crossref","first-page":"e170","DOI":"10.1016\/j.wneu.2021.03.155","article-title":"Retroodontoid and retro-C2 body pseudotumor, pannus, and\/or cyst. A study based on analysis of 63 cases","volume":"151","author":"Goel","year":"2021","journal-title":"World Neurosurg"},{"key":"10.25259\/SNI_756_2022\/ref-3","doi-asserted-by":"crossref","first-page":"161","DOI":"10.3171\/spi.2006.5.2.161","article-title":"Regression of an atlantoaxial degenerative articular cyst associated with subluxation during conservative treatment. Case report and review of the literature","volume":"5","author":"Sagiuchi","year":"2006","journal-title":"J Neurosurg Spine"},{"key":"10.25259\/SNI_756_2022\/ref-4","doi-asserted-by":"crossref","first-page":"85","DOI":"10.14245\/kjs.2013.10.2.85","article-title":"Hemorrhagic synovial cyst associated with rheumatoid atlantoaxial subluxation","volume":"10","author":"Sheen","year":"2013","journal-title":"Korean J Spine"},{"key":"10.25259\/SNI_756_2022\/ref-5","doi-asserted-by":"crossref","first-page":"1152","DOI":"10.1016\/j.spinee.2011.11.007","article-title":"A large retro-odontoid cystic mass caused by transverse ligament degeneration with atlantoaxial subluxation leading to granuloma formation and chronic recurrent microbleeding case report","volume":"11","author":"Takeuchi","year":"2011","journal-title":"Spine J"},{"key":"10.25259\/SNI_756_2022\/ref-6","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1007\/s00234-005-1355-y","article-title":"Periodontoid pseudotumor: CT and MRI imaging","volume":"47","author":"Yu","year":"2005","journal-title":"Neuroradiology"}],"container-title":["Surgical Neurology International"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/surgicalneurologyint.com\/retro-odontoid-pseudotumor-presenting-double-layer-on-mri-a-case-report\/","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/surgicalneurologyint.com\/surgicalint-articles\/retro-odontoid-pseudotumor-presenting-double-layer-on-mri-a-case-report\/","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,9,30]],"date-time":"2022-09-30T09:45:51Z","timestamp":1664531151000},"score":1,"resource":{"primary":{"URL":"http:\/\/surgicalneurologyint.com\/surgicalint-articles\/retro-odontoid-pseudotumor-presenting-double-layer-on-mri-a-case-report\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,9,30]]},"references-count":6,"alternative-id":["10.25259\/SNI_756_2022"],"URL":"https:\/\/doi.org\/10.25259\/sni_756_2022","relation":{},"ISSN":["2152-7806"],"issn-type":[{"value":"2152-7806","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,9,30]]},"article-number":"446"}}