A ranula is a mucocele arising in the floor of the mouth, secondary to obstruction of the salivary ducts of the sublingual glands*.
Most mucoceles tend to resolve spontaneously. Expectant management is advised. Excision if persistence or according to size.
Operative Pediatric Surgery 7º Ed - L Spitz, AG Coran - ISBN: 978-1-4441-6501-2
SCIENTIFIC EVIDENCE* MM Ziegler, RG Azizkhan, D von Allmen, TR Weber. Operative Pediatric Surgery 2º Ed.