Oral Teratoma with Hairy Polyp-Like Features: A Brief Report of a Rare Presentation.

We present a 21-day-old female child presenting with a large oral epithelialized tumor implanted at the rhinopharynx and ethmoid plate through a cleft palate, associated with feeding and respiratory difficulties. The histopathological exam showed mature central adipose tissue, hair follicles, sebaceous glands, and neurovascular structures, lined by keratinized stratified squamous epithelium. Proliferative cartilaginous, glandular, lymphatic, bony, and immature myxoid tissue was seen at the posterior region and insertion. Despite the characterization of the tumor as a teratoma containing structures derived from the three embryonic leaflets, the anterior portion presented a microscopic bigeminal pattern fully compatible with hairy polyp.