TERATOID CYST IN THE FLOOR OF THE MOUTH WITH SQUAMOUS, INTESTINAL, AND RESPIRATORY EPITHELIA

Disontogenic cysts are an embryonic developmental error, classified histopathologically as dermoid, epidermoid, or teratoid. Teratoid cyst, a cystic form of teratoma, is the least common presentation among these cysts. This work describes the clinical case of a tumor in the floor of the mouth, characterized by presence of squamous, intestinal, and respiratory tract epithelium. A 1-year-old girl was referred to service of oral surgery for examination of a swelling in the sublingual region without painful symptomatology. Intraoral examination revealed a swelling lesion on the floor of the mouth with soft consistency, measuring about 4 × 5 cm. Surgery was performed under general anesthesia with complete enucleation of the lesion. Microscopic examination revealed fragments of developmental cystic lesion containing orthokeratinized stratified squamous epithelium with skin adnexa, intestinal and respiratory epithelia, and connective tissue elements. Based on morphologic findings, diagnosis of teratoid cyst was confirmed. The patient was followed up for 1 year without sign of recurrence.