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Intraoperative magnetic resonance imaging (ioMRI) could improve resection. We aim to assess the improvement in gross total resection (GTR), extent of resection (EOR), and residual tumor volume (RV) achieved using ioMRI.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A systematic review was carried out on PubMed\/MEDLINE to identify any studies reporting intra- and postoperative (1) GTR, (2) EOR, or (3) RV in patients who underwent resection of pituitary adenomas with ioMRI. Random effects meta-analysis of the rate of improvement after ioMRI for these three surgical outcomes was intended.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Among 34 included studies (2130 patients), the proportion of patients with conversion to GTR (\u2206GTR) after ioMRI was 0.19 (95% CI 0.15\u20130.23). Mean \u2206EOR was\u2009+\u20099.07% after ioMRI. Mean \u2206RV was 0.784 cm\n                      <jats:sup>3<\/jats:sup>\n                      . For endoscopically treated patients, \u2206GTR was 0.17 (95% CI 0.09\u20130.25), while microscopic \u2206GTR was 0.19 (95% CI 0.15\u20130.23). Low-field ioMRI studies demonstrated a \u2206GTR of 0.19 (95% CI 0.11\u20130.28), while high-field and ultra-high-field ioMRI demonstrated a \u2206GTR of 0.19 (95% CI 0.15\u20130.24) and 0.20 (95% CI 0.13\u20130.28), respectively.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Our meta-analysis demonstrates that around one fifth of patients undergoing pituitary adenoma resection convert from non-GTR to GTR after the use of ioMRI. EOR and RV can also be improved to a certain extent using ioMRI. Endoscopic versus microscopic technique or field strength does not appear to alter the impact of ioMRI. Statistical heterogeneity was high, indicating that the improvement in surgical results due to ioMRI varies considerably by center.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s11102-021-01147-2","type":"journal-article","created":{"date-parts":[[2021,5,4]],"date-time":"2021-05-04T07:03:19Z","timestamp":1620111799000},"page":"644-656","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Impact of intraoperative magnetic resonance imaging on gross total resection, extent of resection, and residual tumor volume in pituitary surgery: systematic review and meta-analysis"],"prefix":"10.1007","volume":"24","author":[{"given":"Victor E.","family":"Staartjes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alex","family":"Togni-Pogliorini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vittorio","family":"Stumpo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7305-550X","authenticated-orcid":false,"given":"Carlo","family":"Serra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luca","family":"Regli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,5,4]]},"reference":[{"key":"1147_CR1","doi-asserted-by":"publisher","first-page":"145","DOI":"10.1007\/s42000-019-00168-8","volume":"19","author":"M Araujo-Castro","year":"2020","unstructured":"Araujo-Castro M, Berrocal VR, Pascual-Corrales E (2020) Pituitary tumors: epidemiology and clinical presentation spectrum. 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