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Case 35491

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Left - infraorbital rami, zygoma buttress, arch

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Canaray 35491

1. Osteosarcoma in the left zygomatic bone

The cortical surface of the bone in the inferior lateral border of the left orbit exhibits an irregular zone of low density, which is suggestive of an infiltrative neoplastic process. Based on the clinically observed mass over bone in this region, it is likely that an osteosarcoma is present. The right orbit appears nomal.

Axial views of left zygomatic bone

These axial cross-sectional images demonstrate the discontinuities on the anterior surface of the cortex of the zygomatic bone at the inferior lateral wall of the orbit. No pathology extends into the left maxillary sinus.

Axial views of normal right zygomatic bone

These axial cross-sectional images demonstrate the normal appearance of the cortex of the right zygomatic bone.

Sagittal views of left inferior lateral orbit

These sagittal cross-sectional images demonstrate the discontinuities in the cortical bone in the left lateral inferior orbit.

Sagittal views of normal right lateral inferior orbit

These sagittal cross-sectional images demonstrate the normal appearance of the cortical bone of the right inferior lateral orbit.

2. Degenerative joint disease in right TMJ

An early osteophyte is forming on the anterior surface of the right condylar head. Flattening has occurred on the posterior inferior surface of the right articular eminence. Subchondral sclerosis has occurred on both articulating surfaces of the right temporomandibular joint. This appearance is suggestive of degenerative joint disease in the right temporomandibular joint.

3. Mild degenerative joint disease in left TMJ

Cortical erosions and flattening are present on the superior surface of the left condylar head. This appearance is suggestive of mild degenerative joint disease in the left temporomandibular joint.