Management of Incidental Osteoma

Diagnostic Criteria

• The presence of a radiopaque lesion with density similar to cortical bone, well-marginated borders, no periosteal reaction, and no bone destruction are characteristic of a benign osteoma 1
• The absence of bone destruction, new bone formation, periosteal swelling, soft tissue swelling, and night pain are indicators that the lesion is likely a benign osteoma 1

Referral Guidelines

• Patients under 40 years with suspected malignancy or persistent pain/palpable mass should be referred urgently to a bone sarcoma center 1
• Patients over 40 years with non-classic benign osteoma features should be investigated for metastatic carcinoma before referral, including CT chest/abdomen/pelvis, whole skeletal imaging, and myeloma screen 1

Biopsy and Treatment

• The National Comprehensive Cancer Network recommends that biopsy should only be performed by the surgeon who will perform definitive resection if malignancy is confirmed, to avoid compromising treatment outcomes 3
• The British Journal of Cancer guidelines advise against performing or arranging biopsy before referral to a bone sarcoma center if there is any diagnostic uncertainty about malignancy 1

Special Considerations

• In cases of diagnostic uncertainty, referral to a musculoskeletal radiologist for expert interpretation or to a bone sarcoma center is recommended 1, 3