biopsy
(BY-op-see)
Removing cells or tissues to check under a microscope. There are 3 kinds of biopsy: only a sample of tissue is removed (incisional biopsy or core biopsy); a sample of tissue or fluid is removed with a needle (needle biopsy or fine-needle aspiration); or a whole tumor or lesion is removed (excisional biopsy).
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Audio contributed by: Whoopi Goldberg