{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T16:40:13Z","timestamp":1756312813726,"version":"3.44.0"},"reference-count":16,"publisher":"BMJ","issue":"2","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2025,1,19]]},"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:p>Hydatid disease, a zoonotic infection caused by <jats:italic>Echinococcus granulosus<\/jats:italic>, primarily affects the liver and lungs but can involve other areas, including muscle tissue, though muscle involvement is rare. This case describes an adolescent girl with a psoas muscle hydatid cyst presenting with abdominal pain, a palpable mass and polymenorrhoea. Imaging and serology confirmed the diagnosis, and treatment included albendazole therapy and surgical excision via transperitoneal laparotomy, followed by a successful recovery with no recurrence at an 18-month follow-up.<\/jats:p>\n               <jats:p>Hydatid disease is transmitted from definitive hosts, like dogs, to humans. Diagnosis can be challenging due to non-specific symptoms, and it typically relies on ultrasound, CT and serology. Surgical removal combined with antiparasitic drugs remains the primary treatment, though newer methods like ultrasound-guided aspiration are emerging. This case underscores the need to consider hydatid disease in differential diagnoses of cystic masses in endemic areas, particularly in paediatric cases.<\/jats:p>","DOI":"10.1136\/bcr-2024-264171","type":"journal-article","created":{"date-parts":[[2025,2,3]],"date-time":"2025-02-03T09:35:20Z","timestamp":1738575320000},"page":"e264171","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Primary hydatid cyst of psoas muscle in an adolescent"],"prefix":"10.1136","volume":"18","author":[{"given":"Avilash","family":"Sahu","sequence":"first","affiliation":[{"name":"Pediatric Surgery, All India Institute of Medical Sciences, Bhubaneswar, Orissa, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Deepti","family":"Naik","sequence":"additional","affiliation":[{"name":"Pediatric Surgery, All India Institute of Medical Sciences, Bhubaneswar, Orissa, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anandit","family":"Bal","sequence":"additional","affiliation":[{"name":"Pediatric Surgery, All India Institute of Medical Sciences, Bhubaneswar, Orissa, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Santosh Kumar","family":"Mahalik","sequence":"additional","affiliation":[{"name":"Pediatric Surgery, All India Institute of Medical Sciences, Bhubaneswar, Orissa, India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2025,2,3]]},"reference":[{"key":"2025082709124538000_18.2.e264171.1","unstructured":"Park K . 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Primary hydatid cyst of the left- sided colon presenting with lower gastrointestinal bleeding; an extremely rare location of extrahepatic hydatid disease. 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