Prenatal diagnosis and management of a ranula.

A ranula is a mucous extravasation cyst which appears as a swelling in the submental and submandibular regions. We describe a case of congenital ranula or retention salivary cyst diagnosed at 22 weeks' gestation. The fetal growth was normal, as was the amniotic fluid volume. Follow-up ultrasound scans revealed no changes in the size or the position of the cyst. Surgical treatment was performed two days after the delivery. There were no complications and no recurrences have occurred to date.