There is a 1 cm low-density lesion within lower pole of the right kidney most consistent with a cyst. no renal masses are identified. no hydronephrosi?

Fluid: Cysts are generally benign fluid collections that can occur in many organs of the body. They generally don;t require any monitoring or treatment. Check with whomever ordered the scan to find out more. Hope this helps!

Cyst?: Renal cysts are common and most are benign. You should talk it over with a urologist & who should follow up with you from year to year. The rest of the findings you mentioned all sound benign and no cause for any concern. Hydronephrosis is urine backing up into the kidney. It seems from what you say it was not found. All urine should go to the urinary bladder not back up to the kidney.

?incidental finding?: Sounds like you had a scan for some other reason. It is not uncommon to find a renal and/or liver cyst. If they have concerning features, then the radiologist will recommend a biopsy. Okay to discuss with your regular doctor.