Plunging ranula in an infant.

This unusual case extends the age range of persons with plunging ranula to include those with congenital neonatal submandibular masses. The congenital nature of plunging ranula has not been widely discussed. Clinical diagnosis can be reinforced by diagnostic imaging (CT, MRI) if the mass extends into or abuts the sublingual space. Definitive treatment (generally excision) leads to resolution of the mass and prevention of recurrence.