Video: What is a biopsy?

A biopsy is the removal of cells or tissues for examination under a microscope. When only a sample of tissue is removed, the procedure is called an incisional biopsy or core biopsy. When an entire tumor or lesion is removed, the procedure is called an excisional biopsy. When a sample of tissue or fluid is removed with a needle, the procedure is called a needle biopsy or fine-needle aspiration. A transurethral resection of a bladder tumor (TURBT) can involve both biopsy and removal of the tumor.

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Learn more about bladder cancer by perusing our Glossary of Terms.