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The patient was treated surgically by resection of the mass. Even though the diaphragm is a rare location for cystic hygroma, it should form part of the differential diagnosis for subdiaphragmatic lesions.<\/jats:p>","DOI":"10.1136\/bcr-2025-264955","type":"journal-article","created":{"date-parts":[[2025,6,10]],"date-time":"2025-06-10T23:45:26Z","timestamp":1749599126000},"page":"e264955","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Incidental finding and surgical management of a diaphragmatic macrocystic lymphatic malformation in a child"],"prefix":"10.1136","volume":"18","author":[{"given":"Yara Hazem","family":"Zaky","sequence":"first","affiliation":[{"name":"Paediatric Surgery, Oxford University Hospitals NHS Foundation Trust, Oxford, England, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keir Dan","family":"Edwards","sequence":"additional","affiliation":[{"name":"Pathology, Oxford University Hospitals NHS Foundation Trust, Oxford, England, 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