Approximately 85% of kidney tumors are renal cell carcinoma (RCC). RCC commonly metastasizes to the lung, bone, and lymph nodes; however, gastric metastasis is exceedingly rare. We present an 86-year-old woman with left-sided RCC with known metastatic disease to the lungs, lymph nodes, and bone, who presented with acute blood loss anemia. After hemodynamic stabilization, esophagogastroduodenoscopy revealed a large infiltrative, polypoid, and ulcerated polyp in the gastric body. After complete polypectomy, histological examination demonstrated gastric mucosa ulcerated by clear-cell carcinoma, compatible with metastatic RCC. Our patient was successfully treated with palliative radiation to the gastric body.
Case Rep Gastroenterol 2021;15:478–481

中文翻译：

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转移性肾细胞癌表现为胃肠道出血

大约 85% 的肾肿瘤是肾细胞癌 (RCC)。RCC 通常转移到肺、骨和淋巴结；然而，胃转移极为罕见。我们介绍了一位患有左侧 RCC 的 86 岁女性，已知有肺部、淋巴结和骨骼的转移性疾病，她出现了急性失血性贫血。血流动力学稳定后，食管胃十二指肠镜检查显示胃体中有一个大的浸润性、息肉状和溃疡性息肉。完全切除息肉后，组织学检查显示胃黏膜被透明细胞癌溃疡，与转移性 RCC 相容。我们的病人成功地接受了胃体姑息性放射治疗。
Case Rep Gastroenterol 2021；15:478–481