Large Sublingual Dermoid Cyst in the Floor of Mouth and Submental Space

A 13 year old boy was referred to the oral and maxillofacial Clinic for an 8 month history of sublingual swelling. The father of the boy stated that the swelling noticed for few months as painless slowly growing mass under his tongue and below his chin. In meanwhile, the patient denied any other symptoms. Physical examination showed a soft, compressible midline sublingual and submental swelling, slightly elevating the tongue (Figures 1A and 1B). The overlying floor of mouth mucosa normal without alteration in salivary flow, submental swelling ill-defined with normal color skin. The computed tomography showed a large, midline lesion in the floor of the mouth, which appeared to be located in both sublingual and submental perforating the mylohyoid muscle (Figures 2A and 2B). The ultrasonic scan of the area demonstrated an infrasonic formation with distinct boundaries (Figure 3).