Question

papillary carcinomas of the renal pelvis, the ureters, and the bladder are histologically:
squamous cell carcinoma
carcinosarcoma
small cell carcinoma
transitional cell carcinoma
basal cell carcinoma

Explanation:

Papillary carcinomas of the renal pelvis, ureters, and bladder are histologically transitional cell carcinomas (also called urothelial carcinomas), as these regions are lined by transitional (urothelial) epithelium. Squamous cell carcinoma is more common in areas like the skin or squamous - lined mucosa. Carcinosarcoma is a rare tumor with both carcinomatous and sarcomatous components. Small cell carcinoma is typical of lung and some other sites. Basal cell carcinoma is a skin cancer. So the correct option is the one with "Transitional cell carcinoma".

Answer:

Transitional cell carcinoma (the option labeled "Transitional cell carcinoma" among the choices)