A number of anatomic triangles can be identified in the neck, the knowledge of which is vital for defining the site, and therefore the possible origin, of expansive lesions. The sternocleidomastoid muscle, which runs obliquely upwards and posteriorly, divides the neck into anterior and posterior triangles. The anterior triangle of each side is bounded by the anterior border of the sternocleidomastoid muscle, the inferior border of the mandible and the median line of the neck (from the manubrium of the sternum to the symphysis menti), and in turn is subdivided into four smaller triangles: submental, submandibular, carotid and muscular triangles. The posterior triangle is bounded, in addition to the sternocleidomastoid muscle anteriorly, by the trapezius and the middle third of the clavicle, and in turn is subdivided into two smaller triangles: supraclavicular and occipital triangles [1].


Thyroid Cancer Thyroid Nodule Parotid Gland Papillary Carcinoma Parathyroid Adenoma 
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