This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
X-ray finding of ostemyelitis within 8 day is: 
Select and explain. 
A. Cystic swelling, B. Soft tissue swelling, C. New bone formation, D. Seyuestrum formation
B: Soft tissue swelling
Answer: B: Soft tissue swelling 
Explanation: B i.e. Soft tissue swelling Radiological features of Acute osteomyelitis: < 7 days Soft tissue swellingQ > 10 days Periosteal reactionQ After 2-6 weeks Lytic changesQ when 50-75% of bone density has been lost