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Dermoid cyst (DC), which is a cystic form of teratoma, is one of developmental anomalies in the soft tissue. DCs originating from ary sinus. The patient was a 44-year-old female who complained of swelling in the left cheek area. We could successfully operate the patient through sublabial approach with good results. Therefore, we present the case and briefly discuss the posible pathogenesis. (Korean J Otorhinolaryngol-Head Neck Surg 2007 ;50 :1164-6)