U.S. doctors online nowAsk doctors free
Redding, CA
A 56-year-old female asked:

What is exophytic renal cysts? my husband has one that is measured 8mm. could it be a precursor to kidney cancer?

4 doctor answers11 doctors weighed in
Dr. Addagada Rao
General Surgery 57 years experience
No: A renal cyst that grows from inside to surface of kidney is called exophytic renal cyst is (are) benign single or multiple, if no symptoms are left alone.
Dr. Terry Woodard
Nephrology and Dialysis 33 years experience
Certainly may be: An "exophytic" mass is one that grows away from the epithelium (or membrane lining) and often heralds a pre-malignant or possibly malignant mass. These need evaluation and management by both a urologist (kidney surgeon) and a nephrologist.
Dr. Lawrence Hochman
Radiation Oncology 32 years experience
No: Cysts are just fluid filled pockets, renal cysts are common and are unrelated to kidney cancer.
Dr. Richard Link
Urology 25 years experience
Unlikely: Exophytic renal cysts are simply cysts that extend outside the kidney capsule. You can envision a "pimple" on the surface of the kidney. Endophytic cysts are those that are buried within the kidney cortex. The 8 mm cyst is very small and difficult to characterize on noncontrast imaging. However, such a small lesion without complex features is highly unlikely to be cancerous. May deserve followup.
Dr. Ed Friedlander
Pathology 45 years experience
One older person in four has a cyst that can be like this. Best left alone unless the radiologist is worried.
Jul 15, 2013
Last updated Apr 24, 2022


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.