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Abstract：
BACKGROUND: Renal cell carcinoma (RCC) is the third most common malignancy in the genitourinary tract. The lungs, bone, lymph nodes, liver, and brain are common metastatic sites of RCC. However, there is limited literature on single omental metastasis of RCC.
METHODS: We present the case of a 44-year-old man with single omental metastasis of RCC after laparoscopic radical nephrectomy. Pathological diagnosis of the resected left kidney revealed pT3a clear cell RCC (Fuhrman grade III). At 6 mo postoperatively, abdominal computed tomography revealed a 12-mm enhancing nodule in the left lower peritoneum. At 7 mo after initial operation, laparoscopic removal of the left omental nodule was performed. The pathological results indicated metastatic clear cell RCC. Currently, the patient is being treated with adjuvant pembrolizumab.
CONCLUSIONS: Omental metastasis of RCC owing to laparoscopic radical nephrectomy is rare. Urologists should be aware of the diverse nature of RCC.
METHODS: We present the case of a 44-year-old man with single omental metastasis of RCC after laparoscopic radical nephrectomy. Pathological diagnosis of the resected left kidney revealed pT3a clear cell RCC (Fuhrman grade III). At 6 mo postoperatively, abdominal computed tomography revealed a 12-mm enhancing nodule in the left lower peritoneum. At 7 mo after initial operation, laparoscopic removal of the left omental nodule was performed. The pathological results indicated metastatic clear cell RCC. Currently, the patient is being treated with adjuvant pembrolizumab.
CONCLUSIONS: Omental metastasis of RCC owing to laparoscopic radical nephrectomy is rare. Urologists should be aware of the diverse nature of RCC.
摘要：
背景：肾细胞癌（RCC）是泌尿生殖道第三常见的恶性肿瘤。肺，骨头,淋巴结,肝脏,和脑是肾癌的常见转移部位。然而,关于肾癌单网膜转移的文献有限。
方法：我们介绍了一个44岁的男性患者在腹腔镜下根治性肾切除术后出现肾癌单网膜转移的病例。切除的左肾的病理诊断显示pT3a透明细胞RCC（FuhrmanIII级）。术后6个月，腹部计算机断层扫描显示左下腹膜有一个12毫米的增强结节。初次手术后7个月，腹腔镜下切除左网膜结节。病理提示：转移性透明细胞肾细胞癌。目前,患者正在接受派姆单抗辅助治疗.
结论：腹腔镜下根治性肾切除术后肾细胞癌转移很少见。泌尿科医师应该意识到RCC的多样性。
方法：我们介绍了一个44岁的男性患者在腹腔镜下根治性肾切除术后出现肾癌单网膜转移的病例。切除的左肾的病理诊断显示pT3a透明细胞RCC（FuhrmanIII级）。术后6个月，腹部计算机断层扫描显示左下腹膜有一个12毫米的增强结节。初次手术后7个月，腹腔镜下切除左网膜结节。病理提示：转移性透明细胞肾细胞癌。目前,患者正在接受派姆单抗辅助治疗.
结论：腹腔镜下根治性肾切除术后肾细胞癌转移很少见。泌尿科医师应该意识到RCC的多样性。
