Primary meningiomas of the sinonasal tract are rare tumors. Their positive diagnosis is difficult to establish. From one case observation, we report the clinical features, the diagnosis difficulties and the therapeutic modalities of primary meningioma of the sinonasal tract.

A seventeen-year-old girl consulted for a left unilateral nasal obstruction with progressive evolution without episodes of epistaxis, smell disorder or headaches over a year. Physical examination revealed a grayish polypoid tumor in the left nasal fossa. CT scan evidenced an isodense lesion of the left nasal fossa slightly enhanced pushing back the lateral nasal wall without invasion or intracranial connection. Biopsy was in favour of an inverted papilloma. The tumor was resected via endoscopic approach. Pathological examination established the diagnosis of meningothelial menigioma. The prognosis was favourable without recurrence after a six-month follow-up.

The positive diagnosis of primary sinonasal meningioma is difficult to establish because of their infrequent occurrence in this ectopic site and of their non-specific clinical appearance. The final diagnosis rests on the histological examination. Immunohistochemical studies are helpful to establish the accurate diagnosis. Imaging confirms the primitive nature of these tumors. Prognosis is excellent after complete surgical extirpation without the necessity of adjuvant therapy.