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Muscular involvement is extremely rare, accounting for only 0.7 % to 0.9 % of cases. This case highlights the diagnostic challenges of muscular hydatid cysts, which can mimic sarcomas, abscesses, or lipomas.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Case report:<\/jats:title>\n                    <jats:p>A 90-year-old female from a rural area presented with a slow-growing swelling on the posteromedial thigh for three years. She had no history of trauma or systemic symptoms. Clinical examination revealed a firm, non-tender mass. Imaging suggested a cystic lesion, and serology confirmed Echinococcus infection. Surgical excision was performed, and histopathology confirmed a hydatid cyst. The patient received a six-week course of albendazole postoperatively. Her recovery was uneventful, with no recurrence at follow-up.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion:<\/jats:title>\n                    <jats:p>Muscular hydatid cysts are rare and often misdiagnosed as soft tissue tumors. Imaging modalities, particularly ultrasound and MRI, aid in diagnosis, while serology provides further confirmation. Complete surgical excision remains the preferred treatment, and antiparasitic therapy reduces recurrence risk.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Although rare, muscular hydatid cysts should be considered in the differential diagnosis of soft tissue swellings, particularly in endemic regions. Early recognition and appropriate management prevent complications and improve patient outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Highlights<\/jats:title>\n                  <\/jats:sec>","DOI":"10.1016\/j.ijscr.2025.111106","type":"journal-article","created":{"date-parts":[[2025,3,3]],"date-time":"2025-03-03T12:11:21Z","timestamp":1741003881000},"update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":2,"title":["Primary hydatid cyst of skeletal muscle: A rare clinical entity"],"prefix":"10.1097","volume":"128","author":[{"given":"Ahmad","family":"Ismail","sequence":"first","affiliation":[{"name":"King Edward Medical University, Lahore 54000, Punjab, Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Syed Mujtaba","family":"Haider","sequence":"additional","affiliation":[{"name":"King Edward Medical University, Lahore 54000, Punjab, Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Urooj","family":"Fatima","sequence":"additional","affiliation":[{"name":"Faisalabad Medical University, Faisalabad, Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Muhammad Shair","family":"Ismail","sequence":"additional","affiliation":[{"name":"Faisalabad Medical University, Faisalabad, Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Usman Ismat","family":"Butt","sequence":"additional","affiliation":[{"name":"King Edward Medical University, Lahore 54000, Punjab, Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","reference":[{"key":"R1-111-20260325","doi-asserted-by":"crossref","first-page":"e99","DOI":"10.1155\/2013\/829471","article-title":"Primary musculoskeletal hydatid cyst of the thigh: diagnostic and curative challenge for an unusual localization","volume":"24","author":"Argy,","year":"2013","journal-title":"Can. 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