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An SVS was then performed for further localization of the adenoma, as other non-invasive methods showed negative results. After SVS, an ectopic adenoma was suspected in the sheath of the left carotid artery, previously considered as a schwannoma, and was pathologically confirmed after the second operation. Postoperatively, the patient\u2019s symptoms disappeared and serum levels of PTH and calcium normalized.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>SVS can provide precise diagnosis and accurate positioning before re-operation in patients with pHPT.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12902-023-01376-5","type":"journal-article","created":{"date-parts":[[2023,7,6]],"date-time":"2023-07-06T11:03:17Z","timestamp":1688641397000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Selective venous sampling in primary hyperparathyroidism caused by ectopic parathyroid gland: a case report and literature review"],"prefix":"10.1186","volume":"23","author":[{"given":"Xubin","family":"Yang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xueyan","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huan","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junwei","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Yao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiongyan","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongrong","family":"Deng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8258-2707","authenticated-orcid":false,"given":"Wen","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,7,6]]},"reference":[{"key":"1376_CR1","doi-asserted-by":"publisher","first-page":"115","DOI":"10.1038\/nrendo.2017.104","volume":"14","author":"MD Walker","year":"2018","unstructured":"Walker MD, Silverberg SJ. 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