{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T01:05:00Z","timestamp":1788397500709,"version":"build-2803163510"},"reference-count":28,"publisher":"BMJ","issue":"4","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["J NeuroIntervent Surg"],"accepted":{"date-parts":[[2015,3,2]]},"published-print":{"date-parts":[[2016,4]]},"abstract":"<jats:sec>\n                  <jats:title>Background and purpose<\/jats:title>\n                  <jats:p>Perimesencephalic subarachnoid hemorrhage (PSAH) is not consistently defined in the existing literature. The purpose of this study was to test the inter-observer variability and specificity for non-aneurysmal subarachnoid hemorrhage (SAH) of an anatomic definition of PSAH.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>Medical records of all patients who underwent catheter angiography for evaluation of non-traumatic SAH between July 2002 and April 2012 were reviewed. Patients with anterior circulation aneurysms were excluded. Three blinded reviewers assessed whether each admission CT scan met the following anatomic criteria for PSAH: (1) center of bleeding located immediately anterior and in contact with the brainstem in the prepontine, interpeduncular, or posterior suprasellar cistern; (2) blood limited to the prepontine, interpeduncular, suprasellar, crural, ambient, and\/or quadrigeminal cisterns and\/or cisterna magna; (3) no extension of blood into the Sylvian or interhemispheric fissures; (4) intraventricular blood limited to incomplete filling of the fourth ventricle and occipital horns of the lateral ventricles (ie, consistent with reflux); (5) no intraparenchymal blood.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>56 patients with non-aneurysmal SAH and 50 patients with posterior circulation or posterior communicating artery aneurysms were identified. Seventeen (16%) of the 106 admission CT scans met the anatomic criteria for PSAH. No aneurysm was identified in this subgroup. Inter-observer agreement was excellent with \u03ba scores of 0.89\u20130.96 and disagreement in 2.8% (3\/106) of cases.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>Our anatomic definition of PSAH correlated with a low risk of brain aneurysm and was applied with excellent inter-observer agreement.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/neurintsurg-2015-011680","type":"journal-article","created":{"date-parts":[[2015,3,23]],"date-time":"2015-03-23T22:42:09Z","timestamp":1427150529000},"page":"378-385","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":17,"title":["Evaluation of an anatomic definition of non-aneurysmal perimesencephalic subarachnhoid hemorrhage"],"prefix":"10.1136","volume":"8","author":[{"given":"Adam N","family":"Wallace","sequence":"first","affiliation":[{"name":"Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ross","family":"Vyhmeister","sequence":"additional","affiliation":[{"name":"Washington University School of Medicine, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey N","family":"Dines","sequence":"additional","affiliation":[{"name":"Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arindam R","family":"Chatterjee","sequence":"additional","affiliation":[{"name":"Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akash P","family":"Kansagra","sequence":"additional","affiliation":[{"name":"Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan","family":"Viets","sequence":"additional","affiliation":[{"name":"Sharp Grossmont Hospital, La Mesa, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Justin T","family":"Whisenant","sequence":"additional","affiliation":[{"name":"Texas Radiology Associates, Plano, Texas, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher J","family":"Moran","sequence":"additional","affiliation":[{"name":"Mallinckrodt Institute of Radiology and Department of Neurological Surgery, Washington University, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"suffix":"III","given":"DeWitte T","family":"Cross","sequence":"additional","affiliation":[{"name":"Mallinckrodt Institute of Radiology and Department of Neurological Surgery, Washington University, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colin P","family":"Derdeyn","sequence":"additional","affiliation":[{"name":"Mallinckrodt Institute of Radiology, Departments of Neurological Surgery and Neurology, Washington University School of Medicine, St Louis, Missouri, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2015,3,23]]},"reference":[{"key":"2025092911263112000_8.4.378.1","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.35.4.493"},{"key":"2025092911263112000_8.4.378.2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.2003.98.3.0529"},{"key":"2025092911263112000_8.4.378.3","doi-asserted-by":"publisher","DOI":"10.1007\/BF01401126"},{"key":"2025092911263112000_8.4.378.4","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1007\/s11883-012-0256-x","article-title":"Nonaneurysmal subarachnoid hemorrhage: an update","volume":"14","author":"Kim","year":"2012","journal-title":"Curr Atheroscler Rep"},{"key":"2025092911263112000_8.4.378.5","doi-asserted-by":"publisher","DOI":"10.3171\/2012.4.JNS112306"},{"key":"2025092911263112000_8.4.378.6","doi-asserted-by":"publisher","DOI":"10.1148\/radiology.201.3.8939211"},{"key":"2025092911263112000_8.4.378.7","doi-asserted-by":"publisher","DOI":"10.1161\/01.STR.30.5.1103"},{"key":"2025092911263112000_8.4.378.8","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A1884"},{"key":"2025092911263112000_8.4.378.9","doi-asserted-by":"publisher","DOI":"10.1007\/s10140-011-0939-6"},{"key":"2025092911263112000_8.4.378.10","doi-asserted-by":"publisher","DOI":"10.1007\/s12028-012-9680-6"},{"key":"2025092911263112000_8.4.378.11","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A1988"},{"key":"2025092911263112000_8.4.378.12","first-page":"829","article-title":"Nonaneurysmal perimesencephalic subarachnoid hemorrhage: CT and MR patterns that differ from aneurysmal rupture","volume":"12","author":"Rinkel","year":"1991","journal-title":"AJNR Am J Neuroradiol"},{"key":"2025092911263112000_8.4.378.13","doi-asserted-by":"publisher","DOI":"10.1161\/01.STR.25.7.1507"},{"key":"2025092911263112000_8.4.378.14","doi-asserted-by":"publisher","DOI":"10.1227\/NEU.0b013e318242575e"},{"key":"2025092911263112000_8.4.378.15","doi-asserted-by":"publisher","DOI":"10.3171\/JNS.2008.109.12.1034"},{"key":"2025092911263112000_8.4.378.16","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1093\/ptj\/85.3.257","article-title":"The kappa statistic in reliability studies: use, interpretation, and sample size requirements","volume":"85","author":"Sim","year":"2005","journal-title":"Phys Ther"},{"key":"2025092911263112000_8.4.378.17","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1968.28.1.0014"},{"key":"2025092911263112000_8.4.378.18","first-page":"1168","article-title":"Intracranial aneurysm. A nine-year study","volume":"62","author":"Hunt","year":"1966","journal-title":"Ohio State Med J"},{"key":"2025092911263112000_8.4.378.19","doi-asserted-by":"crossref","first-page":"E1202","DOI":"10.1227\/01.NEU.0000334426.87024.DD","article-title":"Perimesencephalic nonaneurysmal subarachnoid hemorrhage caused by jugular venous occlusion: case report","volume":"63","author":"Sangra","year":"2008","journal-title":"Neurosurgery"},{"issue":"(24 Pt 2)","key":"2025092911263112000_8.4.378.20","doi-asserted-by":"crossref","first-page":"2410","DOI":"10.1212\/01.wnl.0000314688.26295.03","article-title":"Perimesencephalic nonaneurysmal hemorrhage associated with vein of Galen stenosis","volume":"70","author":"Mathews","year":"2008","journal-title":"Neurology"},{"key":"2025092911263112000_8.4.378.21","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1016\/j.clinimag.2014.01.003","article-title":"The relationship between perimesencephalic subarachnoid hemorrhage and deep venous system drainage pattern and calibrations","volume":"38","author":"Buyukkaya","year":"2014","journal-title":"Clin Imaging"},{"key":"2025092911263112000_8.4.378.22","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1007\/s00701-013-1907-6","article-title":"Anatomical variants of the basal vein of Rosenthal: prevalence in idiopathic subarachnoid hemorrhage","volume":"156","author":"Sabatino","year":"2014","journal-title":"Acta Neurochir (Wien)"},{"key":"2025092911263112000_8.4.378.23","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1016\/j.jstrokecerebrovasdis.2008.03.005","article-title":"Concurrent presentation of perimesencephalic subarachnoid hemorrhage and ischemic stroke","volume":"17","author":"Lansberg","year":"2008","journal-title":"J Stroke Cerebrovasc Dis"},{"key":"2025092911263112000_8.4.378.24","first-page":"108","article-title":"[Perimesencephalic subarachnoid hemorrhage\u2013an independent clinical picture of non-aneurysmatic subarachnoid hemorrhage with a benign course]","volume":"57","author":"Barth","year":"1996","journal-title":"Zentralbl Neurochir"},{"key":"2025092911263112000_8.4.378.25","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1007\/s00701-012-1600-1","article-title":"Basilar tip aneurysm in perimesencephalic like subarachnoid hemorrhage. Importance of exact diagnosis and the role of delayed repeated digital subtraction angiography","volume":"155","author":"Maslehaty","year":"2013","journal-title":"Acta Neurochir (Wien)"},{"key":"2025092911263112000_8.4.378.26","doi-asserted-by":"publisher","DOI":"10.1016\/j.jstrokecerebrovasdis.2005.07.004"},{"key":"2025092911263112000_8.4.378.27","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.63.3.382"},{"key":"2025092911263112000_8.4.378.28","doi-asserted-by":"publisher","DOI":"10.1016\/j.wneu.2010.01.011"}],"container-title":["Journal of NeuroInterventional Surgery"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/neurintsurg-2015-011680","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T18:26:40Z","timestamp":1759170400000},"score":1,"resource":{"primary":{"URL":"https:\/\/jnis.bmj.com\/lookup\/doi\/10.1136\/neurintsurg-2015-011680"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,3,23]]},"references-count":28,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2016,3,15]]},"published-print":{"date-parts":[[2016,4]]}},"alternative-id":["10.1136\/neurintsurg-2015-011680"],"URL":"https:\/\/doi.org\/10.1136\/neurintsurg-2015-011680","relation":{},"ISSN":["1759-8478","1759-8486"],"issn-type":[{"value":"1759-8478","type":"print"},{"value":"1759-8486","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,3,23]]}}}