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New diagnosis
Helllo, I am new to the board.
I had an initial diagnoses of a 3.3cm renal mass in right kidney and urologist recommended surgery to remove as he was 95% sure it was cancerous. I went for pre op today and a new CT scan showed the mass shrunk in about 4 months to 2.5cm. 
is this a common occ and could it kept shrinking?
i am on the fence now between surgey in a couple weeks as planned or active monitoring. 
any feedback would be appreciated and thanks in advance
Comments
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            The measurements are 3 dimensional and not always perfectWhile still small I would get it out,These things d not just go away although in about 10% of the cases what looks like Cancer isn't. Mine was 19 years ago. 2.6 cm on initial CT and 4.2 when they got it out. Small tumors give the Surgeon more options. I may be getting over my Paygrade so look at a second opinion. icemantoo 
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            I had my CT show a 4.1 cmI had my CT show a 4.1 cm mass and my MRI show a 4.3 cm mass and when they removed it the mass was 3.5 cm. Surgery was scary but not nearly as bad as what my mind made it out to be. Mine was in fact renal cell carcinoma so when it was all said and done I am glad it was removed. 
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            CT's are not always the sameEach machine, each Radiologist who reads a computer screen and each measurement can come up with different answers. I know, because, I've been in that situation. Eight mm. is not that much on a ruler, but in a cancer situation, it is. Get it out and let the biopsy determine size, type and stage. Sometimes the way you are lying on the table, or if you have food in your intestine pushing on the kidney, it can effect the reading of size. And I had my appendix taken out by the OB-GYN when he did the hysterectomy in 1987; and my most recent CT, read by a certified Radiologist, indicated I had an appendix. Go Figure. donna_lee 
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            Echoing what others have saidEchoing what others have said. i'd add to Donna's list that even the position you have on the CT machine can change the measurements of anything found. At Between 2.5 and 3.3, i'm not sure you're in a spot where active surveillance is all that great an idea. A talk with your urologic oncologist to discuss your concerns would be a good idea. You need to go into surgery (assuming you choose to do that) with a proper mindset that it's the right thing to do. 
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