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Thyroglossal Duct Cyst
Etiology: remnant of thyroglossal duct between base of tongue + thyroid bed, occur along path of thyroid descent from foramen cecum at tongue base to lower neck
Imaging: paramedian cyst, closely related to strap muscles (sternohyoid, sternothyroid, thyrohyoid, omohyoid muscles)
US: moves with tongue protrusion + swallowing
CT: low density, no contrast enhancement unless infected
MRI: T1 hypointense, T2 hyperintense, no contrast enhancement unless infected