sunburst pattern
A radiographic appearance showing perpendicular bone spicules radiating from the cortex, characteristic of aggressive bone lesions.
Full Definition
The sunburst pattern is a distinctive radiographic finding observed in rapidly growing bone tumors, particularly osteosarcoma. It occurs when reactive new bone formation creates perpendicular spicules that extend from the cortical surface, resembling rays of sunlight. This pattern indicates aggressive tumor growth that has breached the cortex and stimulated an intense periosteal reaction. While not pathognomonic for any single tumor type, the sunburst pattern is most commonly associated with high-grade osteosarcoma and suggests a poor prognosis. Radiologists and orthopedic oncologists use this finding as part of their differential diagnosis and staging assessment.
Usage
Usage note: Always hyphenate when used as a compound modifier.
In Context
- "The radiograph demonstrated a classic sunburst pattern at the distal femur, raising concern for osteosarcoma." — Radiology report
- "Aggressive tumors often exhibit a sunburst pattern due to rapid cortical destruction and periosteal reaction." — Clinical teaching note