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This case report describes the clinical, imaging, surgical, and pathological findings of a 9-year-old spayed female Maltese dog with severe mitral regurgitation and HAC-related systemic calcification presenting as an intracardiac calcified mass.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Case presentation<\/jats:title>\n                    <jats:p>Severe mitral valve thickening and a mobile hyperechoic mass attached to the chordae tendineae were detected on echocardiography. Mitral valvuloplasty was performed, and the calcified mass was excised. Histopathology confirmed a non-neoplastic calcified lesion. Computed tomography revealed extensive calcification in various tissues. The dog developed postoperative aspiration pneumonia and died on postoperative day 2.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This case highlights the potential for intracardiac dystrophic calcification in dogs with HAC and severe mitral valve disease.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12917-025-05172-2","type":"journal-article","created":{"date-parts":[[2025,12,5]],"date-time":"2025-12-05T08:34:44Z","timestamp":1764923684000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Calcified mass attached to mitral valve chordae tendineae in a dog with hyperadrenocorticism: A case report"],"prefix":"10.1186","volume":"22","author":[{"given":"Tomoki","family":"Wada","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryosuke","family":"Takemura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideki","family":"Yotsuida","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomoya","family":"Okano","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takuya","family":"Mori","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,12,5]]},"reference":[{"key":"5172_CR1","doi-asserted-by":"publisher","first-page":"490","DOI":"10.1354\/vp.37-5-490","volume":"37","author":"M Hilbe","year":"2000","unstructured":"Hilbe M, Sydler T, Fischer L, Naegeli H. 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Formal ethical approval was not required for this case; however, all procedures and animal care were conducted in accordance with institutional standards. Written informed consent was obtained from the animal\u2019s owner for all procedures performed.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Written informed consent was obtained from the animal\u2019s owner for the publication of this case report.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"19"}}