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The likelihood of a complete PCOM aneurysm occlusion after endovascular treatment is reduced with the presence of a fetal posterior communicating artery (fPCOM). As a result, anatomical variations in PCOM aneurysms represent a major challenge for the endovascular treatment. This study addresses hemodynamic variations in PCOM aneurysms of either fetal or adult type.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>3D-DSA data of 14 patients with bifurcation aneurysms located in the PCOM junction were collected. Nine patients presented with a fPCOM and five patients an adult PCOM (aPCOM). Patient-specific 3D models containing at least one bifurcation distal the aneurysm in the anterior circulation as well as the PCOM itself were extracted using image-based blood flow simulations. Seven hemodynamic parameters were calculated for all aneurysm models to characterize the intra-aneurysmal blood flow. The PCOM outflow was artificially varied to represent both fPCOM and aPCOM conditions for each model resulting in 28 simulations.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Fetal\u2011type PCOM showed higher intra\u2011aneurysmal mean velocity (median 0.09 vs. 0.06\u00a0m\/s), maximum velocity (0.17 vs. 0.14\u00a0m\/s), averaged wall shear stress (1.67 vs. 1.27\u00a0Pa), neck inflow rate (40.9 vs. 22.4\u00a0ml\/min), and inflow concentration index (0.56 vs. 0.40), with lower pulsatility index (1.73 vs. 1.89). Those differences were significant whereas mean oscillatory shear index did not differ significantly.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The presence of anatomical variations affects the hemodynamic parameters of PCOM bifurcation aneurysms. In particular, the presence of an fPCOM has an unfavorable effect on the intra-aneurysmal flow dynamics.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00234-025-03785-w","type":"journal-article","created":{"date-parts":[[2025,9,20]],"date-time":"2025-09-20T08:01:25Z","timestamp":1758355285000},"page":"2471-2481","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Fetal-type posterior communicating artery increases hemodynamic stress in posterior communicating artery bifurcation aneurysms: a CFD-based analysis"],"prefix":"10.1007","volume":"67","author":[{"given":"Roland","family":"Schwab","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca","family":"Janiszewski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erelle","family":"Fuchs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maximilian","family":"Thormann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Belal","family":"Neyazi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanessa Magdalena","family":"Swiatek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I. 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The correct version should read as follows: Backround The flow characteristics of bifurcation aneurysms in the posterior communicating artery (PCOM) have rarely been studied. In the Keywords section, the last two entries was incorrectly merge. Below is the incorrect keywords; Keywords Aneurysm \u00b7 Endovascular \u00b7 Hemodynamics, PCOM The correct set of keywords should read as follows:Keywords Aneurysm \u00b7 Endovascular \u00b7 Hemodynamics \u00b7 PCOM","order":7,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"14 October 2025","order":8,"name":"change_date","label":"Change Date","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"Correction","order":9,"name":"change_type","label":"Change Type","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"A Correction to this paper has been published:","order":10,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"https:\/\/doi.org\/10.1007\/s00234-025-03812-w","URL":"https:\/\/doi.org\/10.1007\/s00234-025-03812-w","order":11,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Ethical approval was obtained as required according to the guidelines of the local ethics committees (Ethics Committee, Medical Faculty of Otto-von-Guericke-University Magdeburg, Magdeburg, Germany). This anonymous retrospective study, which was conducted in accordance with the Declaration of Helsinki, fulfils the guidelines of the federal state of Saxony-Anhalt. The data has been legally collected in accordance with \u00a715 paragraph [5] (University Hospital Magdeburg).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Human Ethics"}},{"value":"The requirement for individual informed consent was waived by the responsible ethics committees due to the retrospective nature of the study and the use of anonymized data. Where applicable, participants or their legal representatives had previously provided general consent for the use of clinical data in research.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}