Congenital mature cystic teratoma of the parotid gland in an infant: Report of a unique case

Introduction and importance: Teratoma is a germ cell tumor originating from pluripotent germ cells and embryonal cells that commonly occurs in the gonads with only 15 % of it arising in extragonadal sites. In infants and children, teratomas of the head and neck are uncommon that comprise 0.47 %-6 % of all teratomas, and their occurrence in parotid gland is extremely rare. It is considered a diagnostic pitfall preoperatively, and their definite diagnosis can only be made upon surgery followed by histopathological examination. Case presentation: We present a unique case of parotid gland teratoma in a 9-month-old girl who was brought to the hospital by her parents with right side parotid region swelling since birth. The ultrasonographic findings were suggestive of cystic hygroma. Upon surgery, the mass was completely excised with a part of parotid gland. The diagnosis of mature teratoma was made based on the histopathologic examination. No tumor recurrence was noted during the 4-month postoperative follow-up. Clinical discussion: Teratoma of the parotid gland is an extremely rare entity that may mimic diverse benign and malignant tumors of the salivary gland. Patients often present to the health care facility with a parotid gland swelling leading to defacement. Complete surgical resection of the tumor is considered the best treatment approach with careful preservation of facial nerve. Conclusion: Due to the scarcity of information available regarding the behavior and clinical management of parotid gland teratoma in the literature, a good follow-up of patient is required to exclude potential recurrency and neurological deficit.