Here is the excerpts from my CT Scan report, can you please let us know possible problem? I have stomach ache for a long time" A simple cortical cyst is seen at the upper pole of right kidney. The left renal vein is retroaortic. There is mild compression of the renal vein with slightly luminal narrowing as it courses between the aorta and the lumbar vertebra posteriorly. No obvious collaterals seen on the left side.