{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T03:14:43Z","timestamp":1791429283520,"version":"4.3.3"},"reference-count":16,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2025,6,14]],"date-time":"2025-06-14T00:00:00Z","timestamp":1749859200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Objective<\/jats:title>\n                  <jats:p>To evaluate the clinical and radiologic features of acute calcific tendinitis of the longus colli (ACTLC).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>This retrospective, cross-sectional study analysed 30 patients diagnosed with ACTLC from January 2013 to December 2022. Two experienced radiologists independently reviewed CT and MR images to confirm the ACTLC diagnosis and document radiologic findings. Clinical data, including symptoms and laboratory results, were also assessed. The study received approval from the institutional ethics committee, with patient consent waived.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The cohort had a mean age of 49\u2009years and included 19 females (63%). All patients presented with acute cervicalgia, and 29 (97%) exhibited calcifications at the C1-C2 level. A novel imaging feature, termed the \u201cbeak sign,\u201d was observed in 24 of these 29 patients (83%), defined by an acute angle at the margin of calcification pointing towards the C1-C2 intervertebral space. Prevertebral soft-tissue oedema was present in all patients, with 25 (83%) also showing retropharyngeal fluid accumulation. Among the 14 patients who underwent MRI, 11 (79%) exhibited atlantoaxial joint effusion, a feature rarely reported in ACTLC. Follow-up imaging revealed inferior migration of calcifications in 2 patients, with 1 developing a cyst-like appearance in the post-calcific phase\u2014an unreported finding in ACTLC.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>This study represents the largest ACTLC cohort confirmed by cross-sectional imaging. Prevertebral calcifications and soft-tissue oedema were consistently observed in all patients, with the majority also exhibiting retropharyngeal fluid accumulation. This article introduces the \u201cbeak sign,\u201d a novel imaging finding observed in most cases, and identifies atlantoaxial joint effusion as a newly recognized, common imaging manifestation in ACTLC.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Advances in knowledge<\/jats:title>\n                  <jats:p>This review of 30 patients with acute calcific tendinitis of the longus colli introduces the \u201cbeak sign\u201d\u2014an acute angle at the calcification margin pointing towards the C1-C2 intervertebral space\u2014as a novel imaging feature observed in most cases. Additionally, it identifies atlantoaxial joint effusion as a newly recognized, common imaging manifestation of this condition.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/dmfr\/twaf037","type":"journal-article","created":{"date-parts":[[2025,6,14]],"date-time":"2025-06-14T08:35:07Z","timestamp":1749890107000},"page":"420-426","source":"Crossref","is-referenced-by-count":1,"title":["Clinical, CT, and MRI features of acute calcific tendinitis of the longus colli: a case series with novel imaging findings"],"prefix":"10.1093","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1635-2225","authenticated-orcid":false,"given":"Rafael Maffei","family":"Loureiro","sequence":"first","affiliation":[{"name":"Department of Radiology, Hospital Israelita Albert Einstein , Sao Paulo 05652-900,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7695-9670","authenticated-orcid":false,"given":"Daniel Vaccaro","family":"Sumi","sequence":"additional","affiliation":[{"name":"Department of Radiology, Hospital Israelita Albert Einstein , Sao Paulo 05652-900,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8459-1933","authenticated-orcid":false,"given":"Vit\u00f3ria Liz Taumaturgo","family":"da Costa","sequence":"additional","affiliation":[{"name":"Department of Radiology, Hospital Israelita Albert Einstein , Sao Paulo 05652-900,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6247-9673","authenticated-orcid":false,"given":"Regina L\u00facia Elia","family":"Gomes","sequence":"additional","affiliation":[{"name":"Department of Radiology, Hospital Israelita Albert Einstein , Sao Paulo 05652-900,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6951-9156","authenticated-orcid":false,"given":"Carolina Ribeiro","family":"Soares","sequence":"additional","affiliation":[{"name":"Department of Radiology, Hospital Israelita Albert Einstein , Sao Paulo 05652-900,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2025,6,14]]},"reference":[{"key":"2025082903525423300_twaf037-B1","doi-asserted-by":"publisher","first-page":"108653","DOI":"10.1016\/j.ejrad.2019.108653","article-title":"Calcium hydroxyapatite deposition disease: imaging features and presentations mimicking other pathologies","volume":"120","author":"Hongsmatip","year":"2019","journal-title":"Eur J Radiol"},{"key":"2025082903525423300_twaf037-B2","doi-asserted-by":"publisher","first-page":"204","DOI":"10.4055\/cios.2018.10.2.204","article-title":"Clinical and imaging features of longus colli calcific tendinitis: an analysis of ten cases","volume":"10","author":"Suh","year":"2018","journal-title":"Clin Orthop Surg"},{"key":"2025082903525423300_twaf037-B3","doi-asserted-by":"publisher","first-page":"1570","DOI":"10.1002\/lary.23338","article-title":"Prevertebral tendinitis: how to avoid unnecessary surgical interventions","volume":"122","author":"Hammer","year":"2012","journal-title":"Laryngoscope"},{"key":"2025082903525423300_twaf037-B4","doi-asserted-by":"publisher","first-page":"955","DOI":"10.1177\/0194599813482289","article-title":"Incidence of retropharyngeal calcific tendinitis (longus colli tendinitis) in the general population","volume":"148","author":"Horowitz","year":"2013","journal-title":"Otolaryngol Head Neck Surg"},{"key":"2025082903525423300_twaf037-B5","doi-asserted-by":"publisher","first-page":"e8343","DOI":"10.1097\/MD.0000000000008343","article-title":"Case reports about an overlooked cause of neck pain: calcific tendinitis of the longus colli","volume":"96","author":"Kim","year":"2017","journal-title":"Medicine"},{"key":"2025082903525423300_twaf037-B6","doi-asserted-by":"publisher","first-page":"2631","DOI":"10.1007\/s00405-020-06057-w","article-title":"Differentiation of retropharyngeal calcific tendinitis and retropharyngeal abscess: a case series and review of the literature","volume":"277","author":"Langner","year":"2020","journal-title":"Eur Arch Otorhinolaryngol"},{"key":"2025082903525423300_twaf037-B7","doi-asserted-by":"publisher","first-page":"1636","DOI":"10.2106\/00004623-199411000-00006","article-title":"Acute calcific retropharyngeal tendinitis. 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