D2I2.
common

Ranula

A ranula is a mucus extravasation cyst involving a sublingual gland and is a type of mucocele found on the floor of the mouth. Ranulae present as a swelling of consisting of collected mucin from a ruptured gland caused by local . If small and further treatment may not be needed, otherwise minor oral may be indicated.

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Plain-language summary adapted from Wikipedia. Not medical advice.