1. Renal pelvis sarcomatoid carcinoma with renal vein tumor thrombus: A case report and literature review
   Huai-Yong Guan et al, 2023, World Journal of Clinical Cases CrossRef
2. Case report: Sarcomatoid urothelial carcinoma of the renal pelvis masquerading as a renal abscess
   Yaru Chu et al, 2023, Frontiers in Oncology CrossRef
3. Sarcomatoid Variant of Urothelial Carcinoma of the Renal Pelvis with Inferior Vena Cava Tumour Thrombus: A Case Report and Literature Review
   Sameera Rashid et al, 2018, Case Reports in Pathology CrossRef