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Thank you for your question.
If you have the report with you, can you please attach it here for me to see.
did you have any ultrasound prior to having this scan?
Was that normal?
It showed progressive hydronephrosis
The mass that the radiologist mentioned is likely to be a tumor in the kidney.
You will likely also require a CT scan if you have not had that done already.
Also a referral to a urologist to have a look, if that has not already been done.