{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T01:12:01Z","timestamp":1769821921057,"version":"3.49.0"},"reference-count":16,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T00:00:00Z","timestamp":1711843200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T00:00:00Z","timestamp":1711843200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Med Case Reports"],"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Background<\/jats:title>\n                <jats:p>Piriformis muscle mass is rare, which is particular for intrapiriformis lipoma. Thus far, only 11 cases of piriformis muscle mass have been reported in the English literature. Herein, we encountered one patient with intrapiriformis lipoma who was initially misdiagnosed.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Case presentation<\/jats:title>\n                <jats:p>The patient is a 50-year-old Chinese man. He complained of osphyalgia, right buttock pain, and radiating pain from the right buttock to the back of the right leg. Both ultrasound and magnetic resonance imaging demonstrated a cyst-like mass in the right piriformis muscle. Ultrasonography-guided aspiration was performed on this patient first, but failed. He was then recommended to undergo mass resection and neurolysis of sciatic nerve. Surprisingly, final histology revealed the diagnosis of intrapiriformis lipoma. The patient exhibited significant relief of symptoms 3\u00a0days post-surgery.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Diagnosis and differential diagnosis of radicular pain are potentially challenging but necessary. Atypical lipoma is prone to be misdiagnosed, especially in rare sites. It is notable for clinicians to be aware of the presence of intrapiriformis lipoma to avoid misdiagnosis and inappropriate treatment.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13256-024-04507-1","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T01:02:27Z","timestamp":1711846947000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Atypical lipoma of the right piriformis muscle: a case report and review of the literature"],"prefix":"10.1186","volume":"18","author":[{"given":"Xiao","family":"Qiu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoyong","family":"Luo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Renmei","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,3,31]]},"reference":[{"key":"4507_CR1","doi-asserted-by":"publisher","first-page":"2095","DOI":"10.1007\/s00586-010-1504-9","volume":"19","author":"K Hopayian","year":"2010","unstructured":"Hopayian K, Song F, Riera R, Sambandan S. The clinical features of the piriformis syndrome: a systematic review. Eur Spine J. 2010;19:2095\u2013109.","journal-title":"Eur Spine J"},{"issue":"1","key":"4507_CR2","doi-asserted-by":"publisher","first-page":"10","DOI":"10.1002\/mus.21318","volume":"40","author":"JS Kirschner","year":"2009","unstructured":"Kirschner JS, Foye PM, Cole JL. Piriformis syndrome, diagnosis and treatment. Muscle Nerve. 2009;40(1):10\u20138.","journal-title":"Muscle Nerve"},{"issue":"1","key":"4507_CR3","doi-asserted-by":"publisher","first-page":"71","DOI":"10.1053\/j.otsm.2004.09.008","volume":"13","author":"JWT Byrd","year":"2005","unstructured":"Byrd JWT. Piriformis syndrome. Oper Tech Sports Med. 2005;13(1):71\u20139.","journal-title":"Oper Tech Sports Med"},{"key":"4507_CR4","doi-asserted-by":"publisher","DOI":"10.1136\/bcr-2012-007208","author":"O Salar","year":"2012","unstructured":"Salar O, Flockton H, Singh R, Reynolds J. Piriformis muscle metastasis from a rectal polyp. 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Eur Spine J. 2015;24:551\u20134.","journal-title":"Eur Spine J"},{"issue":"2","key":"4507_CR7","doi-asserted-by":"publisher","first-page":"257","DOI":"10.1016\/j.otsr.2015.11.018","volume":"102","author":"JH Park","year":"2016","unstructured":"Park JH, Jeong HJ, Shin HK, Park SJ, Lee JH, Kim E. Piriformis ganglion: an uncommon cause of sciatica. Orthop Traumatol Surg Res. 2016;102(2):257\u201360.","journal-title":"Orthop Traumatol Surg Res"},{"issue":"17","key":"4507_CR8","doi-asserted-by":"publisher","DOI":"10.3171\/CASE21252","volume":"2","author":"J Lodin","year":"2021","unstructured":"Lodin J, Bru\u0161\u00e1kov\u00e1 \u0160, Kachl\u00edk D, Same\u0161 M, Humhej I. Acute piriformis syndrome mimicking cauda equina syndrome: illustrative case. J Neurosurg Case Lessons. 2021;2(17): CASE21252.","journal-title":"J Neurosurg Case Lessons"},{"issue":"1","key":"4507_CR9","volume":"14","author":"N Sanuki","year":"2022","unstructured":"Sanuki N, Kodama S, Seta H, Sakai M, Watanabe H. 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