{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T17:10:19Z","timestamp":1756314619358,"version":"3.44.0"},"reference-count":30,"publisher":"BMJ","issue":"1","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2021,12,9]]},"published-print":{"date-parts":[[2022,1]]},"abstract":"<jats:p>Mesenchymal chondrosarcoma (MC) is a rare cartilaginous tumour that occurs in the extraskeletal locations in about one-third of cases. It is aggressive in behaviour and may involve the lower extremities, central nervous system or spine. Mesenchymal tumours are known for distant metastasis; however, metastasis to bilateral kidneys after treatment has not been reported earlier. We present a case of a soft-tissue intramuscular MC of the thigh in a 38-year-old patient which had been surgically excised after neoadjuvant chemotherapy. The patient presented with bilateral dense calcified renal masses after 6 years, which were cytologically proven as MC metastases. In the evaluation of bilateral calcified renal masses in patients with a history of MC, metastasis should be considered.<\/jats:p>","DOI":"10.1136\/bcr-2021-246375","type":"journal-article","created":{"date-parts":[[2022,1,7]],"date-time":"2022-01-07T11:10:15Z","timestamp":1641553815000},"page":"e246375","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Bilateral renal metastases from extraskeletal mesenchymal chondrosarcoma of thigh"],"prefix":"10.1136","volume":"15","author":[{"given":"Himanshu","family":"Pruthi","sequence":"first","affiliation":[{"name":"Radiodiagnosis and Imaging, Post Graduate Institute of Medical Education and Research, Chandigarh, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3795-8795","authenticated-orcid":false,"given":"Harish","family":"Bhujade","sequence":"additional","affiliation":[{"name":"Radiodiagnosis and Imaging, Post Graduate 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