Basing on the authors' own observations and literature data diagnostic value of different imaging techniques was presented in differentiating pathologic changes deduced from deformations of urinary bladder walls. Modelling of the walls has proved to enable the localisation of the tumour without determining its character. The degree of modelling of urinary bladder wall, however, is proportionate to the size of tumour. In a considerable number of cases it was possible to exclude infiltration of the bladder wall or to show overgrowing it by neoplastic mass.