Plunging Sublingual Dermoid: A Review of Three Different Cases and Management Protocol

Epidermoid and dermoid cysts are rare in oral cavity. We are presenting here three such cases of sublingual dermoid cyst with submental extension (plunging dermoid) who presented in outpatient department with complaints of a slow growing painless swelling in the oral cavity and difficulty in chewing and swallowing solid foods. On clinical examination cystic swelling was seen in floor of mouth displacing the tongue superiorly and posteriorly. Ultrasonography followed by contrast CT scan of neck revealed well defined cystic swelling involving floor of mouth with submental extension. Surgical excision is treatment of choice in these cases. Although the cysts were large and extending through the mylohyoid muscle, intraoral approach was adopted for excision of cyst in all three cases avoiding extraoral neck incision for cosmetic reasons.