The First Report of Urothelial (Clear Cell Variant) Bladder Cancer in a Child.

Urothelial bladder tumours in childhood are extremely rare, with most cases being low grade, superficial disease of the papillary subtype with favourable outcomes. Urothelial (clear cell variant) carcinoma of bladder (UCCVCB) is an exceptional histological finding in both the adult and paediatric population. Herein we describe the first case of UCCVCB diagnosed in childhood. With this case being only the fourth report of confirmed muscle invasion in childhood, we discuss the entity of UCCVCB, and furthermore review all previously reported confirmed cases of childhood muscle invasive urothelial bladder cancer, in general.