Extravasation Mucocele Arising from a Lingual Thyroglossal Duct Remnant

Figure 2

The thyroglossal duct and cyst. (a) The extirpated specimen consists of a 20 × 20 × 15 mm cyst (arrow), the bridging tract (arrowhead), and the middle third of the hyoid bone (asterisk). The perpendicular lines indicate the following three sections (B, C, and D). (b) Extravasation mucocele. Microscopic examination of the specimens through line B shows a nonepithelial lining cyst (hematoxylin-eosin stain; bar = 200 m). Note that there are numerous foamy histiocytes (arrows) adjacent to the nonepithelial lining wall of the cyst. (c) Associated ruptured cyst. Microscopic examination of the specimens through line C shows an associated ruptured cyst (hematoxylin-eosin stain; bar = 200 m). This section is composed of two different parts: the ciliated respiratory epithelium (large arrows) and the no epithelial lining (small arrows). Note the puckered distinct border between these parts (arrowhead), which might have resulted from the rupture of the cyst. The dotted line indicates the presence of the epithelial lining. (d) Thyroglossal duct. Microscopic examination of the specimens through line D shows the thyroglossal duct with transitional epithelium lining and the presence of heterotopic salivary glands (arrows) and ducts (arrowheads) draining into the thyroglossal duct (hematoxylin-eosin stain; bar = 200 m).

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