Dysontogenetic cysts are thought to fall into one of three classes: epidermoids, dermoids or teratoids. Floor of mouth teratoid cysts are the least common presentation reported. Over the last 70 years, fewer than 20 histologically proven cases have been described in the English literature. We report an infant presenting with this lesion in association with a midline tract. The cyst was identified at birth and interfered with feeding. It was surgically excised with no recurrence at 10 month point of follow-up. A literature search revealed that confusing terminology and indirect quotation disseminated false beliefs regarding the epidemiology. Contrary to most reports, floor of mouth teratoid cysts are most commonly encountered in childhood with only a handful of cases in older age groups.
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