[Bladder tumor in young patients: a series of 26 cases. Comparison with a review of the literature].

Objective: Urothelial bladder tumours are rare before the age of 40 and represent only 1% to 4% of all bladder tumours. This study reviews the histological features of these tumours and tries to more clearly define their natural history.

Material And Method: From 1980 to 2000, we observed 2,600 cases of primary bladder tumours; 34 subjects were younger than 40.