腎細胞癌不是一種常見的癌症，其危險因子眾多，症狀變化多端，從沒有症狀，到貧血、發燒、高鈣血症和腫瘤伴生徵候群等都有可能出現。診斷除了靠典型臨床表現外，有不少是透過偶然發現的影像檢查變化，因此如何早期診斷，是一個值得吾人複習的疾病。

Renal cell carcinoma is not a frequently seen malignancy. Its risk factors are many. Its symptoms vary from no symptom to anemia, fever, hypercalcemia and the appearance of paraneoplastic syndrome. In addition to clinical manifestations, the changes in image studies can help make correct diagnosis. Given the difficulty in early diagnosis, this disease is worth reviewing.