Pretracheal nodes that are caused by metastatic laryngeal or thyroid tumours can also present in this region. Nearly all thyroglossal duct cysts are below the hyoid, slightly left of midline, and seen in young people. Infrahyoid masses will be mostly thyroid in origin see Thyroid Surgery. The middle ear will always be abnormal if the cause of the abscess is mastoiditis. An abscess can develop from a necrotic node or from mastoiditis with erosion of the mastoid bone. In the post auricular area lymph nodes can be enlarged by inflammation, lymphoma or metastatic skin tumours like melanoma or SCC from the posterior scalp. These types of masses can occur anywhere in the neck and for that matter on the body. The only masses that characteristically develop in the Back of the Neck are superficial masses like lipomas and sebaceous cysts and vascular or lymphatic malformations.
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