A 35-year-old man from the Nile Delta region of Egypt presents with painless terminal hematuria and dysuria for the past 3 months. He recalls frequent swimming in the Nile River during childhood. Physical examination reveals no suprapubic tenderness. A plain abdominal X-ray shows a characteristic "rim-like" calcification of the bladder outline. The structure marked **C** in the diagram is responsible for this clinical presentation. Which of the following best explains the pathophysiology of the terminal hematuria in this patient?