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Non-enhanced study shows an obstructive calculus at the right ureterovesicular junction with free fluid (urinoma) in the perirenal space and the right paracolic gutter, reaching the pelvis.
Delayed phase shows contrast extravasation from the the right renal collecting system. The rupture is most probably in the right ureteropelvic junction / proximal ureter.
Incidentally noted are two adrenal adenomas lipid rich (measured <10 HU in the precontrast study) and multiple hypovascular cystic liver lesions.