Elastography is an ultrasound measurement that allows a mass to be further evaluated on it's tissue properties of compressibility. More rigid masses tend to be malignant and softer tissue tends to be benign. Ultrasound is a very sensitive test for masses but is not very specific (meaning it will pick up many masses but it cannot tell if a mass is benign or malignant in most cases). Elastography allows us to follow benign appearing lesions which are less concerning therefore avoiding core biopsy. Elastography also allows measurement of infiltrative processes within the tissue before it is identified as a focal mass as the rigidity of the surrounding tissue can be picked up as a "hard" area. This is often helpful for evaluation of palpable lesions when a discrete mass is not yet seen on ultrasound in otherwise normal appearing tissue.