Fine needle aspiration is a biopsy procedure which consists of inserting a thin needle through the skin in order to take a sample of fluid that will be analyzed, thus, confirming or ruling out certain conditions, such as cancer. This type of procedure is performed by puncturing the skin with a thin needle when dealing with affections located in accessible areas such as the breast area, the lymph nodes, or the thyroid gland, or by using an endoscope when the affection is situated in a deeper location allowing the specialist to take samples from the chest or from the abdomen.