{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,21]],"date-time":"2025-08-21T16:47:44Z","timestamp":1755794864733,"version":"3.44.0"},"reference-count":15,"publisher":"Scientific Scholar","content-domain":{"domain":["surgicalneurologyint.com"],"crossmark-restriction":true},"short-container-title":[],"abstract":"<jats:sec id=\"st1\">\n<jats:title>Background: <\/jats:title>\n<jats:p>Pre-bifurcation horizontal segment of the middle cerebral artery (M1) saccular aneurysms were rare and mostly in the mid-portion of M1 - the common location of the origins of the lateral lenticulostriate perforators, or at the branching point of the anterior temporal artery. Pre-bifurcation M1 saccular aneurysm not associated with a branching point is exceptionally rare.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"st2\">\n<jats:title>Case Description: <\/jats:title>\n<jats:p>The authors report a 68-year-old female with a ruptured saccular aneurysm in the M1, which was not associated with an arterial side branch or a bifurcation. The formation of the saccular aneurysm was attributed to the increase in hemodynamic stress at a right-angle angulation in the M1, which was due to the presence of a tight arachnoid band. The patient underwent a craniotomy with clipping of the aneurysm. Her postoperative course was uneventful.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"st3\">\n<jats:title>Conclusion: <\/jats:title>\n<jats:p>This is the first report of an association of an arachnoid band with a cerebral aneurysm, and it supports including arachnoid bands in the list of contributing factors in cerebral aneurysm formation.<\/jats:p>\n<\/jats:sec>","DOI":"10.25259\/sni_506_2025","type":"journal-article","created":{"date-parts":[[2025,8,15]],"date-time":"2025-08-15T14:02:19Z","timestamp":1755266539000},"page":"343","update-policy":"https:\/\/doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A pre-bifurcation horizontal segment middle cerebral artery (M1) saccular aneurysm at a right-angle bend in the M1 with an arachnoid band"],"prefix":"10.25259","volume":"16","author":[{"given":"Sui-To","family":"Wong","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Kwan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"10894","published-online":{"date-parts":[[2025,8,15]]},"reference":[{"key":"10.25259\/SNI_506_2025\/ref-1","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1017\/UPO9781922064004.009","article-title":"Vascular arterial haemodynamics","volume-title":"Mechanisms of vascular disease. 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