A case of urothelial carcinoma of the bladder in a 13-year-old boy is reported. As observed in the literature, it is an extremely rare condition in children. The importance of gross or microscopic hematuria, which is often the only sign of this condition, is underscored. The authors comment on the possible follow-up modalities in relation with the characteristics of this tumor type in young patients. Although it is more invasive (anesthesia, trauma) than US or urinary cytology, cystoscopy is more precise. Because recurrence is extremely rare, it can be performed once a year.