How would you approach a patient with resected renal cell carcinoma, collecting duct type with sarcomatoid and rhabdoid features?   

Although sarcomatoid differentiation is more common in clear cell RCCs, it is also well described in other RCC subtypes, including collecting cell carcinoma. Some argue that collecting duct carcinoma is histologically and clinically closer to a urothelial carcinoma than an RCC subtype. Urothelial ca...