CT
There is a globally enlarged right kidney with an associated thinned cortex and dilated low-density calyces. There is a large branching right renal stone which follows the contours of the calyces and pelvis, consistent with a staghorn calculus. There are multiple additional large stones in the mid and lower calyces. There is mild right-sided perinephric fat stranding. Furthermore, there is discrete contrast retention in the lower calyceal system in the delayed phase, suggestive of severe calyceal obstruction in this region. Patient is status post right double-J stent placement.
The left kidney is normal in appearance, size, and enhancement in all three phases.
Lymph nodes: There is a prominent pericaval lymph node, measuring 2.5 cm in diameter.
Soft tissue: There is a small fat-containing umbilical hernia.