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The classic presentation of renal cell carcinoma (pain, hematuria, and flank mass) occurs in a minority of patients and often is indicative of advanced disease. Common sites of metastatic renal cell carcinoma are lung, soft tissues, bone, and liver. Paranasal sinus is an unusual site for metastasis of renal cell carcinoma. One 73-year-old male presented to Soonchunhyang University Seoul Hospital with melena. Renal cell carcinoma with metastasis to duodenum was diagnosed by computed tomography (CT). He underwent right radical nephrectomy and Whipple’s operation. Positron emission tomography/CT was performed postoperatively, and then metastasis to maxillary sinus was found by accident. He was treated with molecular targeted therapy (pazopanib hydrochloride 800 mg).

Rare Case of Metastasis to Maxillary Sinus Accidently Diagnosed after Operation of Metastatic Renal Cell Carcinoma