{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T12:55:00Z","timestamp":1784292900984,"version":"3.55.0"},"reference-count":40,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,11,1]]},"abstract":"<jats:sec>\n<jats:title>OBJECTIVE<\/jats:title>\n<jats:p>Posterior fossa arteriovenous malformations (AVMs) represent 7% to 15% of all intracranial AVMs and are associated with an increased risk of hemorrhage, morbidity, and mortality compared with supratentorial AVMs, thus prompting urgent and definitive treatment. Cerebellopontine angle (CPA) AVMs are a unique group of posterior fossa AVMs incorporating characteristics of brainstem and cerebellar lesions, which are particularly amenable to microsurgical resection. This study reports the clinical, radiological, operative, and outcome features of patients with CPA AVMs in a large cohort.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>METHODS<\/jats:title>\n<jats:p>The authors conducted a single-surgeon, 2-institution retrospective cohort study of all consecutive patients with CPA AVMs treated with microsurgical resection during a 25-year period.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>RESULTS<\/jats:title>\n<jats:p>CPA AVMs represented 22% (38 of 176) of all infratentorial AVMs resected by the senior author. Overall, 38 patients (22 [58%] male and 16 [42%] female) met the study inclusion criteria and were analyzed. Most patients presented with hemorrhage (n = 29, 76%). The median age at surgery was 56 (range 6\u201382) years. Subtypes included 22 (58%) petrosal cerebellar AVMs, 11 (29%) lateral pontine AVMs, and 5 (13%) AVMs involving both the brainstem and cerebellum. Most AVM niduses were small (&lt; 3 cm; n = 35, 92%) and compact (n = 31, 82%). Fourteen (37%) patients harbored flow-related aneurysms. Twenty (53%) patients underwent preoperative embolization. Complete angiographic obliteration was achieved with microsurgery in 35 (92%) patients. Five (13%) patients with poor neurological conditions at presentation died before hospital discharge. Of the 7 (18%) patients with new postoperative neurological deficits, 5 had transient deficits. The median (interquartile range) follow-up was 1.7 (0.5\u20133.2) years; 32 (84%) patients were alive at last follow-up, and 30 (79%) had achieved a favorable neurological outcome (modified Rankin Scale [mRS] score 0\u20132). The only independent predictor of unfavorable postoperative outcome (mRS score 3\u20136) was the preoperative mRS score (p = 0.002).<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>CONCLUSIONS<\/jats:title>\n<jats:p>CPA AVMs are unique posterior fossa lesions, including petrosal cerebellar and lateral pontine AVMs. The \"backdoor resection\" technique provides a safe and efficient strategy with high obliteration rates and a low risk of treatment-related morbidity. Microsurgical resection should be considered the frontline treatment for most CPA AVMs, except for those with a significant diffuse brainstem component.<\/jats:p>\n<\/jats:sec>","DOI":"10.3171\/2024.3.jns231271","type":"journal-article","created":{"date-parts":[[2024,6,15]],"date-time":"2024-06-15T01:21:57Z","timestamp":1718414517000},"page":"1198-1211","source":"Crossref","is-referenced-by-count":1,"title":["Arteriovenous malformations in the cerebellopontine angle: assessment of the \"backdoor resection\" technique and microsurgical results in 38 patients"],"prefix":"10.3171","volume":"141","author":[{"given":"Sahin","family":"Hanalioglu","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher S.","family":"Graffeo","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Visish M.","family":"Srinivasan","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sufyan","family":"Ibrahim","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph H.","family":"Garcia","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan W.","family":"Koester","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander A.","family":"Aabedi","sequence":"additional","affiliation":[{"name":"Department of Neurological Surgery, University of California, San Francisco, California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua S.","family":"Catapano","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ethan A.","family":"Winkler","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael T.","family":"Lawton","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Barrow Neurological Institute, St. Joseph\u2019s Hospital and Medical Center, Phoenix, Arizona; and"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"issue":"5","key":"b1","series-title":"Neurosurg Focus","first-page":"E12","article-title":"Posterior fossa arteriovenous malformations","volume":"26","author":"Arnaout OM","year":"2009","unstructured":"Arnaout OM, Gross BA, Eddleman CS, Bendok BR, Getch CC, Batjer HH. 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