**7.2 Ultrasound**

Operator-dependent method requires some expertise to use, however, it exempts the patient from exposure to radiation, has a good evaluation of superficial lesions, is low cost, and presents a high image resolution [53–55]. The appropriate probe is chosen for the evaluation of the lesion and adjacent structures, once the probe achieves the right position at the region of choice for material acquisition; the needle is introduced parallel to the probe so that the entire path and tip of the needle can be observed.
