Teratomas including dermoid cysts occur in approximately 1:4000 births with the incidence in the head and neck varying according to different authors between 1.6 and 6.9 per cent.The case presented is of a 28-year-old Caucasian male in whom a dermoid cyst occurred in the floor of the mouth where ultrasound was found useful in the pre-operative assessment.The role of ultrasound in the pre-operative management of lesions in the head and neck is discussed.

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