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We report the case of a healthy, middle-aged woman who initially presented with a lesion suspicious for breast carcinoma, and further workup revealed the presence of an asymptomatic, synchronous primary renal cell cancer, which is a very rare presentation.<\/jats:p>","DOI":"10.1136\/bcr-2021-243563","type":"journal-article","created":{"date-parts":[[2021,10,5]],"date-time":"2021-10-05T13:46:48Z","timestamp":1633441608000},"page":"e243563","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["Primary synchronous malignancies of the breast and the kidney"],"prefix":"10.1136","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3667-8599","authenticated-orcid":false,"given":"Rehan Nasir","family":"Khan","sequence":"first","affiliation":[{"name":"Surgery, Aga Khan University, Karachi, 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