Metastatic Renal Tumor Originating from Hepatocellular Carcinoma: a case report

Secondary malignant tumors of the kidney are uncommon, especially originating from hepatocellular carcinoma. We reported a case of secondary renal tumor from hepatocellular carcinoma and reviewed literatures about this rare presentation and the characteristics of secondary renal tumors. The clinical symptoms and signs including flank pain and hematuria are critical for early detection of metastatic or primary tumor of kidney. However, most of these renal tumors are eventually proven to be primary renal cell carcinoma (RCC). The image features of metastases are small size, multifoci and bilateral. Furthermore, the enhancing pattern and the growth rate are also very helpful. However, it is still very difficult to differentiate a metastatic renal tumor from a primary one. Nevertheless, the possibility of metastatic tumors should always be kept in mind.