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Both pelvic floor ultrasound and magnetic resonance imaging (MRI) examination showed a well-defined mass in the ischioanal fossa, eventually diagnosed as a perianal leiomyoma. It is considered a rare entity because of its location involving the anal sphincter and clinical features. We describe the ultrasonographic and MRI findings of this perianal leiomyoma, together with differential diagnoses and immunohistochemical characterization.<\/jats:p>","DOI":"10.3393\/ac.2020.10.13.1","type":"journal-article","created":{"date-parts":[[2021,6,9]],"date-time":"2021-06-09T03:19:56Z","timestamp":1623208796000},"page":"S58-S62","update-policy":"https:\/\/doi.org\/10.3393\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Imaging Diagnosis of Perianal Leiomyoma: A Case Report"],"prefix":"10.3393","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4528-2473","authenticated-orcid":true,"given":"Enrique","family":"Gonz\u00e1lez-D\u00edaz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Blanca Garc\u00eda","family":"Cengotitabengoa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana Belen Dominguez","family":"Carbajo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Camino Fern\u00e1ndez","family":"Fern\u00e1ndez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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