A case of sarcomatoid transitional cell carcinoma of the renal pelvis is reported. It was distinguished from carcinosarcoma by immunohistochemical study. The tumor was difficult to distinguish from a renal parenchymal tumor in imaging studies because it originated from a duplicated renal pelvis.
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Hisataki, T., Takahashi, A., Taguchi, K., Shimizu, T., Suzuki, K., Takatsuka, K., & Iwaki, H. (2001). Sarcomatoid transitional cell carcinoma originating from a duplicated renal pelvis. International Journal of Urology, 8(12), 704–706. https://doi.org/10.1046/j.1442-2042.2001.00396.x