(BMJ)—A 12-yo girl presented w/ a 3-mo hx of a mass in the floor of her mouth and swelling in the submental area. She had difficulty chewing and swallowing solids. Exam: nontender, fluctuant, bluish mass on L side of floor of mouth. No lymphadenopathy. Nontender external midline swelling. MRI confirmed the dx. What is it?
Thyroglossal duct cyst
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Cystic hygroma
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Plunging ranula
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Cervical thymic cyst
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Branchial cleft cyst
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