Figure 2. Transitional cell carcinoma of a 70-year-old man. (a) Helical CT after administration of 20 ml contrast medium 3–5 min before the bolus injection, the renal pelvis was sufficiently filled and the tumour could be detected (transverse slice in the tubolonephrographic phase). Fast MRI the tumour can be seen without contrast medium, using a T₂ weighted sequence in (b) transverse and (c) coronal plane.