Osteoma are a rare, benign inflammatory tumor of canine bone.
Osteomas are protruding tumor masses composed of abnormally dense, but otherwise normal bone formed in the periosteum. They may resemble exostoses in structure and frequently cannot be differentiated from them on histopathologic examination. Multilobular osteoma (chondroma rodens) has also been reported.
Osteomas frequently protrude from the underlying bony surface. The excised tumor is extremely hard, with a smooth surface that is covered by a zone of connective tissue.
These slowly growing tumors will cause clinical signs only when they impinge on adjacent structures.
Diagnosis is based on clinical presentation with supportive radiography which often displays bony protruberance over normal bone.
Radiographs are necessary to determine possible secondary metastases.
Diagnosis usually requires histopathological examination of bone biopsy. These tumors have a characteristic appearance, with wide trabeculae of mature bone in an irregular pattern. These trabeculae may be lined by mature osteoblasts.
Treatment usually involves wide-margin surgical resection, or use of long-term non-steoridal anti-inflammatory drugs. In cranial osteomas, cranioplasty is usually required with use of a preformed molded polymethylmethacrylate implant.
The prognosis is usually good following crudescence of the tumor.
- Uni of Pennsylvania
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