Abnormalities of the anterior belly of the digastric muscle are rare but have
received increased attention by radiologists in recent years in an attempt to
avoid confusion with submental cysts or enlarged submental lymph nodes on
CT or MR images. We present a case of bilateral accessory digastric muscles
which fuse (partially) with the midline raphe of the mylohyoid muscle. Fibres
from the right accessory anterior digastric muscle proceeded to decussate and
join the mylohyoid muscle and the contralateral insertion of the digastric muscle.
Embryological development and possible clinical consequences are discussed