Osteosarcoma of extragnathic craniofacial bones.

Area of Science:

• Oncology
• Orthopedic Surgery
• Pathology

Background:

• Osteosarcomas of extragnathic craniofacial bones are rare, accounting for less than 2% of all osteosarcomas.
• These tumors often present as high-grade lesions and can be extensive at diagnosis.

Purpose of the Study:

• To characterize the clinical presentation, treatment, and outcomes of osteosarcomas affecting the extragnathic craniofacial bones.
• To determine if these tumors represent a distinct clinicopathological entity.

Main Methods:

• Retrospective review of 21 patients with extragnathic craniofacial osteosarcomas.
• Analysis of patient demographics, tumor characteristics, predisposing conditions, treatment modalities, and survival data.

Main Results:

• The study included 21 patients (12 male, 9 female) aged 6-77 years, with a peak incidence in the third and fourth decades.
• Predisposing conditions included Paget's disease (3 patients) and prior irradiation (3 patients). Most tumors were high-grade (11 osteoblastic, 6 fibroblastic, 1 small cell).
• Survival was poor, with only two 5-year survivors, and nearly half of patients died within 1 year. The sole long-term survivor had a low-grade lesion treated radically when small.

Conclusions:

• Osteosarcoma of the extragnathic craniofacial bones exhibits unique characteristics.
• Given its aggressive nature and poor prognosis, it should be considered a distinct disease entity requiring specialized management.