Biopsies are common to determine if growths are cancerous or to determine the type of tissue that is in an abnormal growth. Sometimes anesthesia is necessary to obtain samples of growths. Growths can be cancerous or noncancerous (benign), and knowing this can determine whether removal of the mass is necessary. The two types of biopsies we perform are FNA (fine needle aspiration) and histopathology (the study of changes in tissues caused by disease).