Renal cell carcinoma (RCC) frequently presents with metastatic spread, sometimes many years after treatment. However, masseter muscle metastasis is extremely rare, with just six reported cases in literature, and none in the United Kingdom (UK). Given its rarity, we hope our case will add to the body of knowledge on the subject and encourage clinicians to maintain a high index of suspicion when reviewing patients with previous RCC and an unexplained mass.
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Karanjia et al. (2024) studied this question.
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