Abstract

Primary extracranial and extraspinal meningiomas are rare.
Case
s involving the orbit, skin, nasal cavity, paranasal sinuses, oral cavity and parotid gland have been reported. The histogenesis of primary extracranial meningioma is still nucertain, but it has been thought that this tumor originates from arachnoid cell rests in displaced during embryonal development. The authors observed a case of primary meningioma of the nasal cavity and paranasal sinuses occurring in a thirty-eight year old male patient in Feb. 1989. He suffered from bulging in the medio-superior portion of left orbit for 15 years, and left nasal obstruction and headache for 5 years, A head CT scan revealed numberous polypoid masses filling the left frontal sinus left ethmoidal sinus, left maxillary sinus and left nasal cavity. During the operation, a connection to the dura was not found. Microscopically, there were discrete lobules or netst of meningothelial cells, beneath the nasal mucosa. They showed an occasional whorling pattern and psammoma bodies. Therefore, this case was diagnosed as primary meningioma, meningotheliomatous type involving the left nasal cavity and paranasal sinuses.

• Keywords: Primary meningioma;Nasal cavity and paranasal sinuses;