Sonography is an easy to apply, inexpensive, and non-invasive diagnostic modality. Although tissues behind bony structures and deep tissues are not delineated, sonography can depict superficial soft tissues very clearly. In the head and neck region, however, it has not yet been widely performed, as the anatomical structures are complicated, and considerable experience is needed both to perform an examination and to make a diagnosis. To perform examinations smoothly, operators must be familiar

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... th the sonographic system in use, and take images at standard planes. To make a correct diagnosis, operators require knowledge of the sonographic anatomies on those planes, representative sonographic signs and artifacts, and common diseases and their typical sonographic findings. In this paper, I have explained how to take sonographic images at standard planes, the sonographic anatomies on those planes, and sonographic findings of common diseases in the oral and maxillofacial regions.