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Osteoma is the most common benign tumor of the nose and paranasal sinuses, and the frontal sinus is its more frequent location (1,2). Paranasal sinus osteoma is a slowgrowing, encapsulated bony tumor that may be commonly asymptomatic, being detected incidentally in 1% of plain sinus radiographs or in 3% of sinus computerized tomographic scans (3). Osteomas are a frequent cause of mucoceles and sinusitis due to blokage of the nasal ducts, but they can also present with more dramatic signs, such as orbital or intracranial invasion (4,5). If larger and invading the orbit, they result in proptosis and/or globe displacement and ocular motility problems (3,5). Fibrous dysplasia is a benign proliferation of fibrous tissue and woven bone (5). This is a disease of unknown etiology and usually found incidentally or following pathological fracture (6). We describe a patient with osteoma of the frontal sinus who presented with right proptosis and severe periorbital swelling. And also fibrous dysplasia of skull adjacent the osteoma was found incidentally. To the best of our knowledge, this is the first case has been presented osteoma associated with fibrous dysplasia of the orbit. ORBITAL EXTENSION OF A LARGE FRONTAL SINUS OSTEOMA ASSOCIATED WITH FIBROUS DYSPLASIA