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Denosumab was administered, but the tumor enlarged. Wide tumor resection was performed. Histopathological analysis confirmed the diagnosis of extraskeletal osteosarcoma. The patient remains alive and disease-free one year after the surgery. In this case, based on the results of the needle biopsy, chemotherapy was not administered, and surgery was prioritized. Because the tumor has a poor prognosis, careful follow-up is recommended and will be continued.<\/jats:p>","DOI":"10.1093\/jscr\/rjag294","type":"journal-article","created":{"date-parts":[[2026,4,7]],"date-time":"2026-04-07T11:36:47Z","timestamp":1775561807000},"source":"Crossref","is-referenced-by-count":0,"title":["Extraskeletal osteosarcoma in the rectus abdominis muscle: a case report"],"prefix":"10.1093","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-6822-9338","authenticated-orcid":false,"given":"Kazunori","family":"Nakayama","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery, Japanese Red Cross Society Kyoto Daiichi Hospital , 15-749 Honmachi Higashiyama-ku, Kyoto 605-0981 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideki","family":"Ueda","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Japanese Red Cross Society Kyoto Daiichi Hospital , 15-749 Honmachi Higashiyama-ku, Kyoto 605-0981 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kento","family":"Fukaya","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Saiseikai Shiga Hospital , 2-4-1 Ohashi Ritto, Shiga 520-3046 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katsumi","family":"Shimomura","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Medicine, Kyoto Prefectural University of Medicine , 465 Kajii-cho, Kamigyo-ku, Kyoto 602-8566 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eiichi","family":"Konishi","sequence":"additional","affiliation":[{"name":"Department of Surgical Pathology, Kyoto Prefectural University of Medicine , 465 Kajii-cho, Kamigyo-ku, Kyoto 602-8566 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