Extravasation Mucocele Arising from a Lingual Thyroglossal Duct Remnant

Figure 3

A possible pathophysiological mechanism of this condition. Excessive production of mucus into the thyroglossal duct (number sign) from the intramural heterotopic salivary glands (arrows) and a physical trauma such as swallowing may lead to extravasation of mucus (asterisk) secondary to a rupture of the thyroglossal duct.