This is a mayor retention cyst which occurs specifically in the floor of the mouth, due to the obstruction of the sublingual or submaxillary gland excretor duct. It is an elevated lesion, ballon-like in aspect, of somewhat elastic and fluctuating consistency, bluish in color, which is located in the anterior part of the floor of the mouth.  It may reach a large size and affect both speech and feeding due to displacement of the tongue. The most affected gland is the sublingual, but it may also affect the submaxillary gland on occasion.

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