Mild uptake may be seen on bone scintigraphy 5. Mature osteomas may demonstrate central marrow ref. Osteomas appearing ivory-like as round, very radiodense lesions, similar to the normal cortex 5. Radiographic features Plain radiograph / CT When multiple, Gardner syndrome should be considered 5 In cancellous bone, the bone marrow is filled with a well-vascularized and moderately cellular and fibrous stroma with inconspicuous osteoblasts and osteocytes and absent inflammatory infiltrate 5. Two histological subtypes are recognized: compact and spongious. These are well-cirumscribed tumors broadly attached to the bone surface 5. Osteomas most commonly occur in bones formed in membrane, almost exclusively occurring in the head 5, with the most common locations including: Osteomas are benign osteogenic tumors composed of lamellar/cortical-type bone. They may be incidentally identified as a mass in the skull or jaw, or as the underlying cause of sinusitis or paranasal sinus mucocele 5. These lesions are benign, slow growing, and usually asymptomatic. Diagnosisĭiagnostic criteria according to the WHO classification of soft tissue and bone tumors (5 th edition) 5:Įssential: bone tumor with compatible imaging tumor arises on the bone source or within the medullary cavity composed of lamellar/cortical-type bone Osteomas are common with an equal male/female distribution 5. Osteoma is the preferred terminology with ivory exostosis, parosteal osteoma, and maxillary/ mandibular torus not recommended per the WHO classification of soft tissue and bone tumors (5th edition) 5.
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