HTHSCI 1DT3 Lecture Notes - Lecture 9: Dermoid Cyst, Thyroglossal Cyst, Pharyngeal Groove
26 Dec 2020
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Ant. margin of scm at junction of upper and middle 3rd. May be difficult due to proximity of carotids. Small opening in lower 3rd of neck on ant. margin of scm. Between tonsillar fossa and ant. border of scm. Just anterior to upper 3rd of scm. 85% of neck lumps are lns: esp. if present < 3wks. 7% other: e. g. sebaceous cyst or lipoma. Line between two angles of the mandible. Developmental inclusion of epidermis along lines of skin fusion. Path of thyroid descent from base of tongue. Can be located anywhere between foramen caecum and the thyroid. Usually just inferior to the hyoid: subhyoid. Fluctuant lump that moves up c tongue protrusion. Sistrunk"s op: excision of cyst and thyroglossal duct. Radial pulse on abduction and external rotation of arm. Compresses lower trunk of brachial plexus, t1 nerve root or stellate ganglion. Herniation of pharyngeal mucosa through its muscular coat at its weakest point.
