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A member asked:

Can a benign tumor become malignant over time? i had a mass on my thyroid checked out about 4 years ago, and the biopsy turned out clean. now it appears the mass has grown. haven't had a second biopsy yet, but was wondering if a mass that was once determi

2 doctor answers4 doctors weighed in
Dr. Geoffrey Rutledge
Internal Medicine 41 years experience
A : A benign tumor is a tumor that lack the ability to spread or 'metastasize.' most benign tumors will not cause problems. Some tumors have abnormal cell growths made up of several sub populations of cells, which can later give rise to a malignant cell growth. So yes, a benign tumor can give rise to a malignant tumor. Any changes to your existing tumor (such as growth) needs to be assessed by a doctor to investigate if the new growth is cancerous.
Dr. Stanley Schwartz
Endocrinology 52 years experience
Yes: Growth worrisome, that's why they recommend re-biopsy.

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Last updated Oct 3, 2016

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