The 'hybrid' fibro-osseous lesion.

A hitherto unreported 'hybrid' fibro-osseous lesion involving the nasal cavity and sinuses is reported. This lesion histologically demonstrated features of ossifying fibroma, cementifying fibroma and aneurysmal cyst. Whilst appearing benign in nature it behaved in a neoplastic manner which necessitated complete surgical excision. A combined clinical, radiological and histopathological approach is advocated and discussed in relation to the treatment of these lesions.