Ultrasonography (USG) has been used in clinical practice for more than half a century. It is one of the most important diagnostic tool in medicine today. Basically in medical imaging it means science of recording sound and interpreting it. Medical applications have adopted ultrasound, notably in obstetrics and cardiology. A range of diagnostic problems that may present in head and neck can be managed with USG. While CT and MR imaging can be used for the evaluation of a variety of head and neck disorders, USG may be the initial modality for evaluating superficial structures. In Head Neck...