Blastomatous tumor with teratoid features of nasal cavity: Report of a case and review of the literature

A case of blastomatous tumor with teratoid features is presented. The polyp oid mass was observed in the left nasal cavity of a 72-year-old man. Histol ogically, the lesion was composed of neuroepithelial cells with blastomatou s appearance, cystic squamous nests filled with keratin materials, many muc ous glands, complex tubular and glandular structures with edematous fibrobl astic stroma. Sinonasal neoplasms including teratoid components and immatur e neuroepithelium are exceedingly rare. We suggest that the term 'immature teratoma' is more suitable than blastoma or blastomatous tumor when there i s no carcinomatous or sarcomatous component besides the immature neuroepith elium and teratoid elements.