Which statement best differentiates bladder cancer from kidney cancer in terms of symptoms and typical age at risk?

• A. Bladder cancer often presents with flank pain and a palpable mass; kidney cancer presents with painless hematuria; risk usually under 40.
• B. Bladder cancer often presents with painless hematuria; kidney cancer presents with flank pain or a palpable mass and hematuria; risk typically over age 50.
• C. Bladder cancer presents with urinary retention; kidney cancer presents with dysuria; age risk both under 30.
• D. Bladder cancer presents with proteinuria; kidney cancer presents with edema; age risk over 60.

Answer: (B)

Differentiating bladder from kidney cancer rests on the typical symptoms and the age pattern seen with each. Bladder cancer most commonly presents with painless hematuria—blood in the urine without pain—because the tumor affects the bladder lining and causes bleeding. Kidney cancer, on the other hand, tends to produce flank pain or a palpable abdominal mass; hematuria can occur, but pain or a detectable mass are more characteristic clues. Both cancers are more common in older adults, usually over age 50, not in younger individuals. So the statement that bladder cancer often shows painless hematuria, kidney cancer presents with flank pain or a palpable mass and hematuria, and risk is typically over age 50 best captures the distinguishing features. Other options mix in non‑classic signs (like urinary retention, dysuria, proteinuria, edema) and younger age ranges that don’t fit these cancers.