University of North Carolina men’s basketball coach Roy Williams had a tumor surgically removed from his right kidney on Sept. 19. An analysis of the tumor has determined it to be benign. The tumor is an oncocytoma (pronounced ON-ko-sigh-TOE-muh), which is a benign tumor of the kidney that is often indistinguishable from kidney cancer on x-rays. These tumors do not spread, unlike cancerous tumors.

As previously announced, Williams also has a tumor on his left kidney. Doctors say that because the tumor on his right kidney was an oncocytoma, there is a good chance that the tumor on the left kidney is the same. Therefore, doctors will perform a biopsy of the left kidney tumor next week. If that tumor is also an oncocytoma, a second surgery would not be needed.

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