PU junction injury

This was a 5-years old boy who had trauma. The ultrasound showed a peri-renal collection. The CT urogram showed a contusion in the right upper pole (Fig. 1), with extravasation of contrast at the PU junction level (Fig. 2), into a peri-renal urinoma (Fig. 3). This was well appreciated on the MIP urogram images (Figs. 4, 5).

A post-operative repeat study was also performed.