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Bladder tumors rarely occur in the first two decades of life, and, in contrast to the cases in adults, 97% of transitional cell carcinomas of the bladder in childhood are low grade, superficial, and of good prognosis, with a progression rate of only 2% to 4%. This report presents a case of low-grade bladder cancer in a 17-year-old patient which behaved quite aggressively. The most striking features...