Gourd-shaped transmylohyoid dermoid cyst occurring in the oral floor: a case report

Dermoid cysts of the oral floor are rare cystic lesions of the oral cavity characterized by ectodermal-derived tissue. Normally, lesions appear round or ovoid on imaging. We report a rare case of a gourd-shaped dermoid cyst on the oral floor. An 11-year-old boy with a painless swelling in the oral floor and submental region was referred to our hospital, and magnetic resonance image presented a ground-shaped lesion through the bilateral mylohyoids. A cystic lesion was suspected, and excision was performed under general anesthesia. The excised lesion was then gourd. Pathological examination revealed a dermoid cyst. The patient's postoperative course was uneventful, and no recurrence was observed.