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Ultrasonography and mammography revealed a large, ill\u2010defined, hypoechoic, heterogeneous, dense lobulated lesion without calcifications. Fine needle aspiration cytology showed atypical cells. Computed tomography of the brain, chest, and abdomen ruled out extra\u2010mammary origin and metastasis. Wide local excision of the lesion followed by histopathological and immunohistochemical analyses confirmed the diagnosis of primary EES\/PNET of the breast. The patient underwent adjuvant chemotherapy. Early diagnosis and multidisciplinary treatment are essential to improve prognosis and survival rates.<\/jats:p>","DOI":"10.1002\/ccr3.70863","type":"journal-article","created":{"date-parts":[[2025,9,10]],"date-time":"2025-09-10T03:45:44Z","timestamp":1757475944000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Extraskeletal Ewing's Sarcoma\/Primitive Neuroectodermal Tumor of the Breast in a Young Woman"],"prefix":"10.1002","volume":"13","author":[{"given":"Shejuti","family":"Sharmin","sequence":"first","affiliation":[{"name":"Department of Oncology SQUARE Hospitals LTD.  Dhaka Bangladesh"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fahad Mohammad","family":"Sadat","sequence":"additional","affiliation":[{"name":"Department of Pathology Chattogram CMH  Chattogram Bangladesh"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Farzana","family":"Hafiz","sequence":"additional","affiliation":[{"name":"Department of Pathology SQUARE Hospitals LTD.  Dhaka Bangladesh"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Md. Mahabub","family":"Alam","sequence":"additional","affiliation":[{"name":"Department of Pathology SQUARE Hospitals LTD.  Dhaka Bangladesh"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3634-7260","authenticated-orcid":false,"given":"Ishtiaq Ur","family":"Rahim","sequence":"additional","affiliation":[{"name":"Department of Oncology SQUARE Hospitals LTD.  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