Dermoid cyst of parotid- A rare case presentation

A dermoid cyst is the most common of the teratomatous lesions in the head and neck region, approximately 7% of all dermoids occurring in this region. (Som et al., 2003; Taylor and Erich, 1967) Histologically, it contains two germ cell layers and skin appendages (e.g., hair follicles and sebaceous glands). An epidermoid cyst is less common in the neck than a dermoid cyst and is comprised solely of ectoderm. Dermoid/epidermoid cysts are frequently midline in location, typically arising either in the floor of mouth deep to the mylohyoid muscles or in the suprasternal notch. They may also occur in the orbit, nasal, and oral cavities. Dermoid cyst of the parotid gland is extremely rare, and due to this and absence of pathognomonic findings, it is often difficult to diagnose preoperatively. It must be differentiated from malignant tumours and other cystic lesions. Dermoid cysts usually recur after simple excision, so it is mandatory to excise it completely with a parotidectomy. This case presents a case report of parotid dermoid cyst with a brief review of literature.