CT - CT KUB
Both kidneys are fused across midline in horseshoe configuration, forming renal isthmus at L2-L4 vertebral level.
Right kidney is composed of three distinct calyceal systems demarcated by well-defined cortical bands in between, making a triplex configuration. Isthmus of the horsheshoe configuration is made fully by the third moiety of the right kidney.
Left kidney is duplex in configuration.
All moieties of both kidneys, including the isthmus (third moiety of right kidney) show prompt and symmetric uptake of IV contrast. However, excretion is very slow in both moieties of left kidney.
Cortical thickness and corticomedullary differentiation are well-defined in all three moieties of the right kidney, with mild dilatation of calyces and pelves.
Left kidney shows severe cortical thinning in both moieties, with gross pelvicalyceal dilatation, clubbing of fornices and abrupt narrowing at pelviureteric junction (PUJ).
All three moieties of right kidney unite into a single ureter, which appears prominent (6 mm).
Left side has two ureters that are not dilated.
No radiodense stone is seen in either kidney or ureter.
Abdominal aorta is bifurcated at L2 level. IVC is bifurcated at L4 level as normal.