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What kind of contrast is used for a loopogram?
Cysto-conray II (iothalamate at 81 mg iodine / ml) is often used. Isovue-300 (iopamidol 300 mg iodine / ml) may also be used.
Why is it normal to see mild dilatation of the upper collecting systems on a loopogram?
Since it is a freely-refluxing system, mild dilatation of the upper collecting system is acceptable.
What is the differential for narrowing at the ureteroileal anastomosis?
1) Post surgical fibrosis; 2) recurrent tumour
The red arrow points to the tight distal ureteroileal stenosis.
A superimposed radiopaque pill measures 12 mm.