Fig. 13

A 31-year-old woman with ureteropelvic junction obstruction. a Axial CT image shows pelvic dilatation (arrowhead) caused by ureteropelvic junction compression by lower pole segmental renal artery (arrow). b The image reconstructed through an oblique sagittal plane, known as “hilar clock-face view”, obtained orthogonal to the renal hilum, shows the relationship between the lower pole segmental renal artery (arrow) and the ureteropelvic junction (arrowhead). c Coronal CT image on the portal venous phase shows the ureteropelvic junction compressed (arrow) by lower pole segmental renal artery originating from the abdominal aorta (arrowhead)