抄録
We reported two cases of cemento-ossifying fibroma which occurred on the mandible of children, and discussed about their findings of several diagnostic imagings, including orthopantomogram, computed tomography (CT) and magnetic resonance imaging (MRI).
A10-year-old-girl (case 1) had orthopantomogram and MRI, and a 7-year-old-girl (case 2) had orthopantomogram and CT.
Preoperative orthopantomogram revealed a well-circumscribed, radiolucent lesion with mixed radiopacity in the mandibular body region. Dislocation of the tooth and mild root resorption were seen. After extirpation and bone currettage, we followed up the patients with orthopantomogram. When it recurred, orthopantomogram showed septum like structure and marked calcified foci in the well-circumscribed radiolucent area.
Preoperative CT examination revealed a large mass lesion in the body of the mandible which expanded bone cortex markedly, but did not destroy it. A few calcified foci were demonstrated in the lesion. CT which was taken for follow-up revealed soft tissue and water density mass that mixed calcified foci markedly in the body of the mandible.
On MRI, the recurrent tumor showed speckles of low signal intensity in isointense lesion on T1-weighted images. T2-weighted images showed to be in homogenous, low to high signal intensity mass in mandibular body to ramus region.
