Radiological imaging of a giant sinonasal ossifying fibroma

Ossifying fibroma is a rare benign fibro-osseous tumor that usually involves the maxilla or the mandible. X-ray and computed tomography (CT) is indispensable in characterizing these tumors and determining their extent of involvement. Magnetic resonance imaging (MRI) is useful in assessing orbital and intracranial extension. In this case report, we describe a rare giant juvenile variant of ossifying fibroma of the sinonasal tract in a 17-year-old boy, spanning across the nasal cavity, frontal, ethmoid and maxillary sinuses, and even extended posteriorly through the choana into the nasopharynx.