Abstract
Dermoid cysts are relatively rare in the floor of the mouth, with approximately 7% occurring in the head and neck, particularly in the lateral eyebrow region and the oral cavity. Dermoid cysts of the floor of the mouth can be classified into three types based on their anatomical relationship with the mylohyoid muscle: sublingual, submental, and submandibular. Furthermore, histologically, they can be categorized as dermoid cysts, epidermoid cysts, and teratomas. The characteristic “sack of marbles” appearance has been observed on magnetic resonance imaging （MRI） scans, and is considered to be decisive for the diagnosis of dermoid cysts based on the internal structural findings, in addition to peripheral rim enhancement. Herein, we present the case of a 23-year-old female patient with dermoid cysts on the floor of the mouth; the distinctive “sack of marbles” appearance was seen on the MRI scan. The patient underwent surgical excision via an intraoral approach under general anesthesia. The final histopathological evaluation confirmed a diagnosis of dermoid cysts. Good wound healing at the surgical site and no local recurrence were noted after 5 years of follow-up. The findings of this report may aid in the definitive diagnosis of dermoid cysts in the head and neck region.
