Huge ureteric transitional cell carcinoma
80 year old man with right flank pain.
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CT demonstrates a very large right sided ureteric mass with trapped contrast, which almost mimics a vascular aneurysm, and proximal long standing hydronephrosis.
Note that the images were obtained with a 30 minute delay due to machine malfunction - as such the parenchyma appears to be 'non-contrast' despite the presence of some contrast in the collecting system on the left.
The mass was confirmed to be a transitional cell carcinoma (TCC) when the patient had a nephroureterectomy.