{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T04:45:18Z","timestamp":1776141918738,"version":"3.50.1"},"reference-count":45,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,6]]},"abstract":"<jats:sec><jats:title>OBJECTIVE<\/jats:title><jats:p>Ossification of pterygoalar and pterygospinous ligaments traversing the superior aspect of the infratemporal fossa results in formation of osseous bars that can obstruct percutaneous needle access to the trigeminal ganglion through the foramen ovale (FO), interfere with lateral mandibular nerve block, and impede transzygomatic surgical approaches. Presence of these ligaments has been studied on dry skulls, but description of their radiological anatomy is scarce, in particular on cross-sectional imaging. The aim of this study was to describe visualization of pterygoalar and pterygospinous bars on computed tomography (CT) and to review their prevalence and clinical significance.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>The authors retrospectively reviewed 200 helical sinonasal CT scans by analyzing 0.75- to 1.0-mm axial images, maximum intensity projection (MIP) reconstructions, and volume rendered (VR) images, including views along the anticipated axis of the needle in percutaneous Hartel and submandibular approaches to the FO.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Ossified pterygoalar and pterygospinous ligaments were readily identifiable on CT scans. An ossified pterygoalar ligament was demonstrated in 10 patients, including 1 individual with bilateral complete ossification (0.5%), 4 patients with unilateral complete ossification (2.0%), and 5 with incomplete unilateral ossification (2.5%). Nearly all patients with pterygoalar bars were male (90%, p &lt; 0.01). An ossified pterygospinous ligament was seen in 35 patients, including 2 individuals with bilateral complete (1.0%), 8 with unilateral complete (4%), 8 with bilateral incomplete (4.0%), 12 with bilateral incomplete (6.0%) ossification, and 5 (2.5%) with mixed ossification (complete on one side and incomplete on the contralateral side). All pterygoalar bars interfered with a hypothetical needle access to the FO using the Hartel approach but not the submandibular approach. In contrast, 54% of complete and 24% of incomplete pterygospinous bars impeded the submandibular approach to the FO, without affecting the Hartel approach.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>This study provides the first detailed description of cross-sectional radiological and applied surgical anatomy of pterygoalar and pterygospinous bars. Our data are clinically useful during skull base imaging to predict potential obstacles to percutaneous cannulation of the FO and assist in the choice of approach, as these two variants differentially impede the Hartel and submandibular access routes. Our results can also be useful in planning surgical approaches to the skull base through the infratemporal fossa.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2019.2.jns182709","type":"journal-article","created":{"date-parts":[[2019,5,17]],"date-time":"2019-05-17T23:41:35Z","timestamp":1558136495000},"page":"1942-1951","source":"Crossref","is-referenced-by-count":14,"title":["Ossification of the pterygoalar and pterygospinous ligaments: a computed tomography analysis of infratemporal fossa anatomical variants relevant to percutaneous trigeminal rhizotomy"],"prefix":"10.3171","volume":"132","author":[{"given":"Tomasz","family":"Matys","sequence":"first","affiliation":[{"name":"Section of Neuroradiology, Department of Radiology, University of Cambridge, Biomedical Campus, Cambridge;"},{"name":"Departments of Radiology and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tariq","family":"Ali","sequence":"additional","affiliation":[{"name":"Departments of Radiology and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fulvio","family":"Zaccagna","sequence":"additional","affiliation":[{"name":"Section of Neuroradiology, Department of Radiology, University of Cambridge, Biomedical Campus, Cambridge;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Damiano G.","family":"Barone","sequence":"additional","affiliation":[{"name":"Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ramez W.","family":"Kirollos","sequence":"additional","affiliation":[{"name":"Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom;"},{"name":"Department of Neurosurgery, National Neuroscience Institute, Singapore; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tarik F.","family":"Massoud","sequence":"additional","affiliation":[{"name":"Division of Neuroimaging and Neurointervention, Department of Radiology, Stanford University School of Medicine, Stanford, California"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1","series-title":"J Craniomaxillofac Surg","doi-asserted-by":"publisher","first-page":"104","DOI":"10.1016\/j.jcms.2007.05.009","article-title":"An anatomical study of the pterygospinous and pterygoalar bars and foramina\u2014their clinical relevance","volume":"36","author":"Antonopoulou M","year":"2008","unstructured":"Antonopoulou M, Piagou M, Anagnostopoulou S: An anatomical study of the pterygospinous and pterygoalar bars and foramina\u2014their clinical relevance. 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