This is a 24-year-old patient seen in the second trimester:

The large mass arising from the mouth could represent

1. an epignathus (but it would be more solid and the roof of the mouth would be abnormal)
2. a epulis (a granular cell tumor usually from the gingiva)
3. a oral cephalocele (but the intracranial anatomy was too normal)
4. a Ranula which is a obstructed salivary duct
   

This was indeed a ranula.