Biopsy is a test performed by a surgeon, radiologist, or cardiologist extract of sample cells or tissues tested to determine the presence or extent of disease. The tissue is examined by a pathologist under a microscope and also analysed chemically. When an entire lump or are is removed, the procedure is called excisional biopsy. An incisional biopsy or core biopsy samples a portion of the abnormal tissue without attempting to remove the entire lesion or tumour. When a sample of tissue or fluid is removed with a needle in such a way that cells are removed without preserving the histological architecture of the tissue cells, the procedure is called a needle aspiration biopsy. Biopsies are commonly performed for insight into possible cancerous conditions.