Sarcomatoid urothelial carcinoma of the renal pelvis.

@article{Canacci2006SarcomatoidUC,
  title={Sarcomatoid urothelial carcinoma of the renal pelvis.},
  author={Anastasia M Canacci and Gregory T. Maclennan},
  journal={The Journal of urology},
  year={2006},
  volume={175 5},
  pages={1906}
}