Computed tomographic findings in primary mandibular osteosarcoma

Osteosarcoma of the mandible is a rare tumour. Two cases examined by computed tomography (CT) are presented. The osteolytic, osteoblastic and extra-osseous components are excellently shown by CT. The attenuation coefficient of calcified and non-calcified osteoid is extremely variable, with densities ranging from +19 to +320 EMI units. The extension of lesions into the pterygopalatine fossa, infratemporal fossa and cranial cavity are precisely defined on CT, information which is necessary for surgical and radiotherapy planning.