PMC4158279_01
Radiographs reveal a well-defined, lobed mass in the midportion of the clavicle.
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fig1
Radiographs revealed a well-defined, 9 x 6 cm, lobed mass in the midportion of the clavicle bone (Figure 1).
Computed tomography scan reveals that the heavily ossified mass is attached to the cortex and has no areas of lucency. The cortex underlying the osteoma is intact. (a) Coronal image of the left clavicle; (b) sagittal image of the left clavicle.
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fig2
The cortex underlying the osteoma was intact (Figures 2(a) and 2(b)).
Magnetic resonance imaging reveals that the lesion has the same density as cortical bone. (a) A coronal T1-weighted image shows that the lesion has low signal intensity located in the midportion of the clavicle. (b) This coronal T2-weighted image shows the lesion with low signal intensity.
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fig3
Magnetic resonance imaging (MRI) showed that it had the same density as cortical bone (Figures 3(a) and 3(b)).
Histological examination shows that the tissue consists of dense sclerotic lamellar bone.
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fig4
Thus, a diagnosis of parosteal osteoma was made (Figure 4).